Added the code to allow a user to define a watched resource in the .shifter.json file.
Added the watched-types configuration.
Fixed test for getKey type normalization function.
Changed watched-types to watched-extensions.
Allows for --watch multiple time instead of an object as an argument.
Cleaned up watched extensions tests wording and variable names.
Expanded upon the tests for watched-extensions.
Changed the 'watched-extensions' global config to array instead of object.
Updated version of cssproc dependecy to 0.0.3