Solution Search Fix Migration

This migration fixes the text search vector triggers and functions on
the database so that problems with solutions can be searched.
Merge pull request #126 from maxwward/master

Solution search bug fix Issue #69
Revision search fix

Addressing search for comments on exercise posts

issue #69
Merge pull request #127 from maxwward/master

Revison to search fix
Solution Comments bug fix

This addresses issue #67.

post.py updated so that set_cached_comments would be called on solution
post_types
Merge pull request #128 from maxwward/master

Solution comment bug fix
Merge branch 'master' of heroku.com:scopeproject
Merge pull request #129 from objcow/master

Many issues resolved
Merge pull request #131 from objcow/master

Issue #130
Merge branch 'master' of heroku.com:scopeproject
Fix to Database Trigger Bug

get_dependent_comments was blowing up on new exercises.  coalesce to
fake it out.
Merge pull request #132 from maxwward/master

Database Trigger Bug Fix
Use "answer" instead of "solution" across the board.
Remove unused templates.
LaTeX wrapper in mathjax and report changed from '$$' to '!!'
Add drag and drop in cart to re-order report
Add a 'x' link in cart to remove an item
Bug fix in txt report format
Relocation of CART button to sidebar for #130; moved cart css styles from bottom_scripts to styles.less
Resolved issue #103

Conflicts:
	askbot/templates/exercise/solution_card.html
Add problem_card back.

Accidentally deleted in the last merge.
Merge pull request #136 from yingmao/master

multiple changes and bugs fixed
Issue #103, completing collapsing of problems