Fix inconsistency in unit tests related to testModel-reflections.xml

The META-INF/reflections/testModel-reflections.xml file is created by
ReflectionsCollectTest, and its presence was expected in
ReflectionsTest.testResourcesScanner(). The assertion wasn't always
satisfied, depending on the order of execution of tests.

Make testResourcesScanner() exclude testModel-reflections.xml from
scanned resources and change the assertion not to expect the excluded
file.
Merge pull request #38 from flow/test-fix

Fix inconsistency in unit tests related to testModel-reflections.xml