Bug 1085004 - Remove mIsCachable (always true and unused). r=irving
Bug 1108557 - Debug log tab needs a findbar. r=aleth

--HG--
extra : amend_source : dfed10bbaa7185bc20ecc00e3a92a01c8ab863ec
Bug 1081534 - icaljs is broken in Lightning nightly. r=philipp

--HG--
extra : histedit_source : 113bd1e5d796943135e3433b41391deaef92421f
Bug 846123 - Reduce the time consumption from O(n^2) to O(n) when copying email between two IMAP-folders. r=Neil a=clokep

--HG--
extra : amend_source : eb70e303ad1e39e531cbc71e63caa92097303347
extra : histedit_source : 33fd759420f4a08fe21fce904d19161b81d29b93