Add cases that were failing in pluralization specs to singularization spec.
Add cases that were failing in pluralization specs to singularization spec.

merb/merb,merb/merb,merb/merb,wycats/merb,wycats/merb,benburkert/merb-core,wycats/merb,benburkert/merb-core,wycats/merb,wycats/merb