diff --git a/.travis.yml b/.travis.yml
index 6458c71..4432c30 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,16 +1,16 @@
 language: php
 
 php:
-  - 5.3
-  - 5.4
-  - 5.5
   - 5.6
+  - 7.0
+  - 7.1
 
 env:
-  - SYMFONY_VERSION=2.6.*
-  - SYMFONY_VERSION="dev-master symfony/debug:~2.7@dev symfony/http-kernel:~2.7@dev"
+  - SYMFONY_VERSION=2.8.*
+  - SYMFONY_VERSION="dev-master symfony/debug:~2.8@dev symfony/http-kernel:~2.8@dev"
 
 before_script:
+  - phpenv config-add myphp.ini
   - composer self-update
   - composer require symfony/framework-bundle:${SYMFONY_VERSION} --no-update
   - composer update --no-interaction --prefer-source
@@ -22,4 +22,4 @@ script:
 
 matrix:
   allow_failures:
-    - env: SYMFONY_VERSION="dev-master symfony/debug:~2.7@dev symfony/http-kernel:~2.7@dev"
+    - env: SYMFONY_VERSION="dev-master symfony/debug:~2.8@dev symfony/http-kernel:~2.8@dev"
diff --git a/myphp.ini b/myphp.ini
new file mode 100644
index 0000000..56cf4d9
--- /dev/null
+++ b/myphp.ini
@@ -0,0 +1,2 @@
+date.timezone = "Europe/Paris"
+always_populate_raw_post_data = -1
diff --git a/src/BeSimple/SoapBundle/Converter/XopIncludeTypeConverter.php b/src/BeSimple/SoapBundle/Converter/XopIncludeTypeConverter.php
index b83e38d..773e175 100644
--- a/src/BeSimple/SoapBundle/Converter/XopIncludeTypeConverter.php
+++ b/src/BeSimple/SoapBundle/Converter/XopIncludeTypeConverter.php
@@ -12,7 +12,7 @@ namespace BeSimple\SoapBundle\Converter;
 
 use BeSimple\SoapBundle\Soap\SoapRequest;
 use BeSimple\SoapBundle\Soap\SoapResponse;
-use BeSimple\SoapBundle\Util\String;
+use BeSimple\SoapBundle\Util\BsString;
 use BeSimple\SoapCommon\Converter\TypeConverterInterface;
 
 /**
@@ -40,7 +40,7 @@ class XopIncludeTypeConverter implements TypeConverterInterface
 
         $ref = $include->getAttribute('href');
 
-        if (String::startsWith($ref, 'cid:')) {
+        if (BsString::startsWith($ref, 'cid:')) {
             $cid = urldecode(substr($ref, 4));
 
             return $request->getSoapAttachments()->get($cid)->getContent();
diff --git a/src/BeSimple/SoapBundle/Util/String.php b/src/BeSimple/SoapBundle/Util/BsString.php
similarity index 98%
rename from src/BeSimple/SoapBundle/Util/String.php
rename to src/BeSimple/SoapBundle/Util/BsString.php
index b95d53e..0aa5d60 100644
--- a/src/BeSimple/SoapBundle/Util/String.php
+++ b/src/BeSimple/SoapBundle/Util/BsString.php
@@ -15,7 +15,7 @@ namespace BeSimple\SoapBundle\Util;
  *
  * @author Christian Kerl <christian-kerl@web.de>
  */
-class String
+class BsString
 {
     /**
      * Checks if a string starts with a given string.
diff --git a/src/BeSimple/SoapCommon/Type/KeyValue/Boolean.php b/src/BeSimple/SoapCommon/Type/KeyValue/BsBoolean.php
similarity index 85%
rename from src/BeSimple/SoapCommon/Type/KeyValue/Boolean.php
rename to src/BeSimple/SoapCommon/Type/KeyValue/BsBoolean.php
index bfe684a..7e81c90 100644
--- a/src/BeSimple/SoapCommon/Type/KeyValue/Boolean.php
+++ b/src/BeSimple/SoapCommon/Type/KeyValue/BsBoolean.php
@@ -5,7 +5,7 @@ namespace BeSimple\SoapCommon\Type\KeyValue;
 use BeSimple\SoapBundle\ServiceDefinition\Annotation as Soap;
 use BeSimple\SoapCommon\Type\AbstractKeyValue;
 
-class Boolean extends AbstractKeyValue
+class BsBoolean extends AbstractKeyValue
 {
     /**
      * @Soap\ComplexType("boolean")
diff --git a/src/BeSimple/SoapCommon/Type/KeyValue/Float.php b/src/BeSimple/SoapCommon/Type/KeyValue/BsFloat.php
similarity index 85%
rename from src/BeSimple/SoapCommon/Type/KeyValue/Float.php
rename to src/BeSimple/SoapCommon/Type/KeyValue/BsFloat.php
index 6d286b0..fe63c9a 100644
--- a/src/BeSimple/SoapCommon/Type/KeyValue/Float.php
+++ b/src/BeSimple/SoapCommon/Type/KeyValue/BsFloat.php
@@ -5,7 +5,7 @@ namespace BeSimple\SoapCommon\Type\KeyValue;
 use BeSimple\SoapBundle\ServiceDefinition\Annotation as Soap;
 use BeSimple\SoapCommon\Type\AbstractKeyValue;
 
-class Float extends AbstractKeyValue
+class BsFloat extends AbstractKeyValue
 {
     /**
      * @Soap\ComplexType("float")
diff --git a/src/BeSimple/SoapCommon/Type/KeyValue/Int.php b/src/BeSimple/SoapCommon/Type/KeyValue/BsInt.php
similarity index 86%
rename from src/BeSimple/SoapCommon/Type/KeyValue/Int.php
rename to src/BeSimple/SoapCommon/Type/KeyValue/BsInt.php
index 0e0c190..369423c 100644
--- a/src/BeSimple/SoapCommon/Type/KeyValue/Int.php
+++ b/src/BeSimple/SoapCommon/Type/KeyValue/BsInt.php
@@ -5,7 +5,7 @@ namespace BeSimple\SoapCommon\Type\KeyValue;
 use BeSimple\SoapBundle\ServiceDefinition\Annotation as Soap;
 use BeSimple\SoapCommon\Type\AbstractKeyValue;
 
-class Int extends AbstractKeyValue
+class BsInt extends AbstractKeyValue
 {
     /**
      * @Soap\ComplexType("int")
diff --git a/src/BeSimple/SoapCommon/Type/KeyValue/String.php b/src/BeSimple/SoapCommon/Type/KeyValue/BsString.php
similarity index 85%
rename from src/BeSimple/SoapCommon/Type/KeyValue/String.php
rename to src/BeSimple/SoapCommon/Type/KeyValue/BsString.php
index 29473a9..7b11b9a 100644
--- a/src/BeSimple/SoapCommon/Type/KeyValue/String.php
+++ b/src/BeSimple/SoapCommon/Type/KeyValue/BsString.php
@@ -5,7 +5,7 @@ namespace BeSimple\SoapCommon\Type\KeyValue;
 use BeSimple\SoapBundle\ServiceDefinition\Annotation as Soap;
 use BeSimple\SoapCommon\Type\AbstractKeyValue;
 
-class String extends AbstractKeyValue
+class BsString extends AbstractKeyValue
 {
     /**
      * @Soap\ComplexType("string")