test(coqModelForm): add test for coqModelForm Service
feat(coq-model-attribute): $attributes items value can now be object

If object given as $attributes item value, it will be used as
attributes to add on element

Closes #9
fix(coq-model): little hack to fix double-$compile issue with ng-click

Related #7
style(coq-model): rename unused vars to "_"

Closes #13
style(CoqFactory): remove unused variable
style(Coq): remove useless comments