Down API to 10
Added infos for AboutLibraries library.
Reverted minSdkVersion to 14

Simplified contructors.
Fixed broken preview in Android Studio.
Merge branch 'master' of https://github.com/StephaneBg/FloatingActionButton-1 into StephaneBg-master
Merge branch 'StephaneBg-master'

Conflicts:
	library/build.gradle
	library/src/main/java/com/melnykov/fab/FloatingActionButton.java
Refactor code