Binders full of documentation updates

* Fixed all PEP-8 violations in docs/conf.py
* Fixed a Sphinx build warning in docs/install.rst
* Add license to SoftLayer.managers.iscsi as it wasn't showing in docs
* Minor updates to readme, and taming of extremely long lines
* Added Pull Requests link to footers and header nav in docs
* Updated some examples in proper docs
* Minor wording/spelling fixes in proper docs
* Extremely long lines (inconsistent, some were wrapped, some not)
  were tamed in the proper docs
* Ensured proper capitalization of SoftLayer and GitHub in a number
  of places
* Updated RPM spec to reflect MIT license
* Updated CLAs to use consistent line wrapping and removed a bit of
  trailing whitespace