Update text plugin information
Trailing whitespaces
Mac OSX installation instructions
Fixing installation doc (Brew instead of Macports)...
Adding some more information about virtualenv
Merge existing work from pull request #2438 from oscarmlage/oscarmlage/doc_fixes

oscarmlage/doc_fixes

Conflicts:
	docs/getting_started/installation.rst
	docs/getting_started/plugin_reference.rst
docs: fixed internal ref
Merge pull request #2673 from Chive/fix/doc-fixes

Docs: Mac OSX Instructions & Virtualenv