fix choose file button (style and text)
fix vertical align in computer tab
fix font-weight on computer tab
change arrow on computer tab
remove top border from dialog
fix font-weight on preview tab
change texts on preview tab
fix blink during iframe loading
fix dialog overlay color and behaviour
on draging computer tab state
crop state title
Merge pull request #53 from uploadcare/bunch-of-fixes

Design fixes
0.6.5
fix posible perfomance issue
remove overlay changes on hover
.initialize and .widget according to new API
New Widget API
Custom events for Widget API
Updated index demo for new widget API; removed invalid stuff
Remove wrapper on event off