Filter 'My plans' list with JS.

This simply tries to match the text content of each row against
the query, for now.
Add clear button to remove filtering
Prevent filter form from submitting when JS is enabled
Add a message when there are no matches for the filter term
tablesorter styling
Prevent cancel button's default action
Filter form styling
Allow filtering of user's projects by :filter param
Don't use form helpers for filter form so extra query params aren't added
Some simple tests to start to cover user project filtering
Attempt to centre the configure cog in the toolbar
Align toolbar with table
Merge pull request #101 from uoldmp/filter-plan-list

This allows users to filter their plan lists based on simple query terms.