Rename files with .rst extension so they render nicely in project site.

--HG--
rename : CHANGES.txt => CHANGES.rst
rename : README => README.rst
Update comment to reflect new understanding and local bug report.
Moved Crypto tests to their own module.
Use mock to patch getpass
Moved OS X tests to their own module
Moved Gnome tests to their own module.
Move some helpers to tests/util.py
Moved file tests to their own module
Moved Google tests to their own module
Moved SecretService tests to their own module.
Added tag 1.1 for changeset 04ebd90b5150
Removed buildout as a subrepo