Update README.rst

Add syntax highlighting to examples
Various compat changes for Python 3
Fix regression for Python 2
Remove cell_l10n.html
Added greek translation
Handle L10N column support in Django 1.2
Added proper information to the hedaer of .po file
Merge pull request #136 from spapas/master

Added greek translation
Avoid using {% cycle %} for Django 1.2-1.6 compatibility
All tests pass on Python 3.2
Fix tests for Python 2
Add exclusions for old Django version for Python in Travis
Ignore PendingDeprecationWarning warnings
Fix tox/travis config, include Django 1.5
Fix for Python 3.3
Remove need for SKIP_HAYSTACK env variable, to help Travis
Use http rather than https for dependencies, hopefully fixes Py3.3 builds
Turn off pip -q to get more debug information for Travis
Install new progressbar first for Travis
Added Portuguese translation (pt_PT)