Mostly typos, grammar errors and inconsistent indentation in code
examples.
Some errors detected using Topy (https://github.com/intgr/topy), all
changes verified by hand.
* Enabling the specification of a default authority, if no default is found then the first available authority is selected
* PEP8
* Skipping tests relying on keytool
Curtis Castrapel
Marti Raudsepp
kevgliss