Updated youtrack content script to work with youtrack-6
Merge pull request #162 from 1ed/youtrack-update

Updated youtrack content script to work with youtrack-6
Fixed tag selection z-index
Fixed tags selection issue
Fixed description field width
Added css reset to fix edit popup styles
Css cleanup
Fixed post start popup disabling issue, closes #161
Added duration mode support, closes #166
0.4.6