organize imports, formatting
cleaned up pom module descriptions
Merge remote-tracking branch 'upstream/develop' into develop

Conflicts:
	xchange-core/src/main/java/com/xeiam/xchange/rest/RestInvocationHandler.java
Merge remote-tracking branch 'upstream/develop' into develop

Conflicts:
	xchange-core/src/main/java/com/xeiam/xchange/rest/RestInvocationHandler.java
Merge branch 'develop' into demo-tests