Improve module manager to accept instance
usage of associative array, Fix CS & add tests
Move loading module by name in an other method
Merge branch 'features/enable-manual-module-instance' of git://github.com/blanchonvincent/zf2 into feature/3814
[#3814] CS fixes

- trailing whitespace
Merge branch 'feature/3814' into develop

Close #3814