Test: fixed issues with BlanketJS configuration.
Am.Module: excluded one line from code coverage tests for convenience. (Requires blanketJS PR#460).
Am.Route: excluded a few lines from code coverage tests for convenience. (Requires blanketJS PR#460).
Test: added tests for Am.Config.set() and unset().
Am.Config: fixed issues with unset() method and nested configuration.
Merge branch 'dev-test' into dev