showing and subscribing to unclassified counts
add toggle button for unclassified failures.
exclude unclassified count from try branches.

better handling for filtering by unclassified failures.
code cleanup
test fix
ui cleanup
fixed merge conflicts
Merge branch 'master' into unclassified-counts
fix bug in similar jobs, u key a toggle
Merge pull request #70 from mozilla/unclassified-counts

Unclassified counts