Localizations according to flask.ext.babel standard mechanism
locales validation and remove duplication of en_US in settings
Check for default language corruption
commented code deleted
Explicit Babel defaults removed
Updated Release Manager Instructions
Finalize release instructions

Also fix a few other minor notes in README
Add more developer instructions to README

In particular, to HACKING.rst
Merge pull request #259 from kcrisman/releaseinstructions

Include correct release instructions
dist.sh: Remove all sagenb stuff from dist/ dir on -s arg
Remove unneeded rm

This is already done in the script itself.
Add info on 'sage -f' when needed
Even more minor release instruction fixes
Update Sagenb version to 0.11.1
Fix path for babel

babel.cfg was not updated when we moved flask_version
Merge pull request #262 from kcrisman/master

Fix path for babel
Make init.sage work

Ideally, this would later be changed to use `attach` again.
Fix various sage import locations
Create nodoctest.py

This should fix the doctest errors in sagenb, as well as give a tiny bit of info to anyone seeking to use Grinder with sagenb.
Merge pull request #280 from jdemeyer/fix_imports

Fix various sage import locations