Fixed some javadoc jdk8 complaints
Made source compatible with JDK1.6
Merge branch 'master' of https://github.com/rharder/jpushbullet2

Conflicts:
	src/main/java/net/iharder/jpushbullet2/PushbulletClient.java
Not sure.
Merge branch 'master' of https://github.com/rharder/jpushbullet2
Fixed some generics unchecked exceptions.