move a tab to any window
Merge commit '36ecd8e96029396230e178607fbdf60cdb59e692' into dev-move-tab

* commit '36ecd8e96029396230e178607fbdf60cdb59e692':
  window用のcssを少し書いた
  update the snapshot and the title of tabs in realtime
use jquery-ui library
fix Gruntfile for bower libraries
move a tab to any window with drag and drop
Merge branch 'dev-move-tab'

* dev-move-tab:
  move a tab to any window with drag and drop
  fix Gruntfile for bower libraries
  use jquery-ui library
  move a tab to any window