2107: Disable 'perform task' when task is locked.
2122: fixed duplicate wistia entries causing media compilation to fail
2107: Hide everything but assignment info when task is blocked
Merge branch 'i-2107' of github.com:pculture/unisubs into i-2107
Merge branch 'production' into i-2107
Merge pull request #129 from pculture/i-2107

2107: Fix blocked tasks styling