OPEN - task 11: Better tests 
http://github.com/markus1978/emf-fragments/issues/issue/11

Refactored statistics and index assertions.
OPEN - task 11: Better tests 
http://github.com/markus1978/emf-fragments/issues/issue/11

Added indexed set test for xmi and binary fragments.
Did some bugfixes of bugs that came up during test imporvements.
OPEN - task 16: Binary resources do not persist extrinsic IDs 
http://github.com/markus1978/emf-fragments/issues/issue/16

Fixed this issue.
OPEN - task 11: Better tests 
http://github.com/markus1978/emf-fragments/issues/issue/11

Added index assertions to indexed class tests.
OPEN - task 11: Better tests 
http://github.com/markus1978/emf-fragments/issues/issue/11

Most test cases now look for actual id of objects rather than just check
for the existing of objects.
OPEN - task 11: Better tests 
http://github.com/markus1978/emf-fragments/issues/issue/11

Added tests for the correct handling of opposites.