Added:
Utils - added validateCategoryName, assertNotKeyword
CategoryNode - changed setExpected
MethodNOde - added changeCategoryExpectedStatus,
removeMentioningCategory, updated testcases
Added category type change support. It requires tests.
Merge branch 'dev-abstract_models' of
https://github.com/testify-no/ecFeed into dev-abstract_models

Conflicts:
	ecfeed/src/com/testify/ecfeed/model/CategoryNode.java