Merge pull request #1 from benlau/DEV

Added new components: QATextInput and Switch
.travis.yml: Changed the repo to upgrade to Qt 5.3.2
Added QuickAndroid::dp() function for C++ code to obtain the DP value.
QuickAndroid::dp() - Changed to be a static method.
Fixed a build problem for Android
Merge branch 'master' of github.com:benlau/quickandroid into DEV