Update classifiers and keywords in setup.py.
Move jquery/pyproxy/HISTORY.txt to CHANGES.rst
Adapt imports to work in Plone 3.3 through 4.3.
Add buildout config for testing.
Fix import of 'this' in the tests/sample code.
Add empty upgrade step to properly set our profile version.
Fix plone tests so they do not fail when there is a different theme name.

Plone 3 has 'Plone Default' and Plone 4 has 'Sunburst Theme'.
Avoid DeprecationWarnings in the tests.

Also try to fix a PicklingError in Plone 4.1, but failing for the moment.
Avoid warning about missing translation domain for profiles.
Note warning about PicklingError in Plone 4 tests.
Update manifest.