try to fix icons problem on HDPI screens
implementation of isHighDPI for cocoa
remove fontawseome icons; fix mac focused border problem
Merge pull request #154 from haiwen/fix-hdpi

Fix icons probelm on HDPI displays
no longer asks the user to choose a drive when init
add more space above "Recent Updated"
[win] fixed a problem when restored from minimized state
updated i18n
fixed margin between avatar and account info on mac
update version to 3.1.1
improve styles for mac
show unread messages tray icon on mac
improve download repos dialog size on mac
[mac] remove linkage to Carbon
[mac] small tweak on download-repo-dialog
Merge pull request #162 from Chilledheart/temp

[mac] small tweak on download-repo-dialog
only display activities tab when supported
[mac] tweak the spacings of download-repo-dialog
Merge pull request #163 from Chilledheart/temp

[mac] tweak the spacings of download-repo-dialog
do not show rotate icon when repo in "sync init" state