Great progress (sadly done in a single commit):
- created annotations for easily creating custom "Payloads".
- implemented new hittypes (Transaction, Timing, Social, PageView, Item, AppView, AnalyticsException)
- various other changes
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/test/java/de/perdoctus/jga/SystemInfoTest.java
	src/test/java/de/perdoctus/jga/payload/AnalyticsExceptionTest.java
	src/test/java/de/perdoctus/jga/payload/PayloadTestBase.java
	src/test/java/de/perdoctus/jga/payload/types/BooleanValueTest.java