fix(skel): config file read and models naming

This is a temporary solution to make Kabam Application works
* read config files and merge them
* fix schema naming to conform to mongoose samples (using singular instead of plural names)
* kabam variable naming

require('kabam') is not a constructor, so it shouldn't use Capitalized variable name. This is important so the user know if he has to use the keyword 'new' or not.
We have to use different variable name for the module name and the instance name of kabam.