[mac] bump version to 3.1.3
Merge pull request #167 from Chilledheart/release-3.1.3

[mac] bump version to 3.1.3
use Q_WS_X11
Update version to 3.1.4.
Merge pull request #168 from Chilledheart/patch-2

use Q_WS_X11
Merge branch '3.1'
support not unsync a repo when not found on server
Update version to 3.1.5.
[build] remove unused ossp-uuid depenedency for osx
Merge pull request #172 from haiwen/bugfix_osx_no_uuid

[build] remove unused ossp-uuid depenedency for osx
using double instead of float for scalefactor
Merge pull request #174 from haiwen/fix_type_of_scale_factor

using double instead of float for scalefactor
update menu icons and some ui tweaks
add remove-gray icon
support edit account host address
Merge pull request #176 from haiwen/enhance_more_2x_icons

update menu icons and some ui tweaks
use new account menu icons
refactor common code of icons to utils/
ignore http request errros for /api2/events/
add play-gray icons