Merge pull request #2393 from waterlou/master

add preferred_dependency to WTGlyphFontSet
Merge pull request #2394 from waterlou/master

fix always load subspec fontawesome in WTGlyphFontSet
[Update] IAMenuController (0.1.3)
[Update] IAMenuController (0.1.4)
Tsuga: 0.0.2
Added SystemConfiguration framework to FXReachability podspec
update WTGlyphFontSet to 0.6