sanitize rating comments
Merge pull request #323 from migeruhito/rating_comments

Provisional workaround to sanitize rating comments
Move babel import inside function
Update Sagenb version to 0.11.2
Update instructions to use GNU tar

This should at least partially fix Sage Trac 17490.
Correct localization information

This is not a full answer to #313 but is a start to making this information correct.
Update release instructions

Adding any relevant stuff from old release instructions,
mainly to remind of prerequisites.
Remove outdated instructions

(From the readme)
Themes infrastructure
themes rendering and Test theme
themes running except worksheets
Themes on worksheets - Help added
Themes added and Test theme removed
Added themes data files to setup.py
Support for Samuel Ainsworth's new UI themes
Samuel Ainsworth's new UI added as a theme
Templates updates in sync with master for Non-NewUI themes
rebase conflict solved
Prepare themes for issue #210
preparing themes for different error messages when adding users