Return non-zero rc instead of None

… be passed in similar to post reqeusts

…lso fixed unicode xml decoding error

…e to pass in as a kwarg

Master -> Develop for 1.6.5

Additional headers on every request and fix unicode decoding issue

auto-doc all class constructor parameters

…s_block

Add return code for invalid args block

Python's cstringio doesn't support unicode characters,
when encountering them Exceptions are raised. We've
decided to use stringio instead, trading potential
performance improvements for full unicode support.

In Python 2, this may lead to a slight performance hit
since we're no longer explicitly using the native version.

However, in Python 3 stringio will automatically use the
native version if available and there should be no noticeable
performance changes.

Searchcommands: add full support for unicode

... by using the six library

Make the explorer example compatible w/ Python 3

Use self._connection

 Run CI against Splunk 7.2

- Correct logic to always look for cert files when verify=True
- Pass key_file and cert_file to handler from HttpLib
- Changed default value of verify to False for backward compat