Pre-release v0.1.5

Documentation, access level tweaks, refactoring

• Changed access level of main classes to 'open' allowing subclassing of certain main WooOS classes such as WooOrder and WooProduct.
• Changed acces levels of remaining classes and appropriate class members to 'public' to allow access outside the module for developers.
• Put WooID in its own file.
• Put WooTagOrderBy in its own file.
• Put WooTagRequestParameter in its own file and added documentation.
• Added documentation to the remaining classes that needed it. WooRequest convertible has still not been fully documented.
• Created WooAuthentication file in anticipation of refactoring auth functions out of WooAPI and into their own class.