Several large refactorings

* Refactor location of all data files to include a subdirectory
  for the mod version
* Update the BaseModel class to allow models to load themselves from
  any text file (whether JSON or CG)
* Refactor ModPack & ModVersion to move the laoding functionality in
  one into the other (and use the new stuff in BaseModel)
* Move the parser versions into a new subdirectory which allows for
  future additional parsers

test/test.coffee

@@ -32,8 +32,8 @@ require './inventory.test'
 require './inventory_parser.test'
 require './mod_pack.test'
 require './mod_version.test'
-require './mod_version_parsers/v1.test'
-require './mod_version_parsers/v2.test'
+require './parser_versions/mod_version_parser_v1.test'
+require './parser_versions/mod_version_parser_v2.test'
 require './string_builder.test'
 
 mocha.checkLeaks()