Coref elements don't contain "references" element any longer.
Merge branch 'common_dev' into naf

Conflicts:
	src/main/java/ixa/kaflib/ReadWriteManager.java
coid => id
Role ID's changed from "prXrX" to "rlX"
Merge branch 'common_dev' into naf
Edge elements have ID attribute
Merge branch 'common_dev' into naf
There was a bug on entity constructor
Merge branch 'common_dev' into naf

Conflicts:
	src/main/java/ixa/kaflib/KAFDocument.java