Add js-base64 as a client side dependency
Add basicAuth utility method
Add AuthModel for holding authorization in diamondash's global config
Add a base Model for diamondash's models with a custom sync() with auth support
Rebuild diamondash.js after allowing optional auth to be used
Move DiamondashConfigModel to diamondash.models
Add test for AuthModel.stringify()
Merge branch 'feature/issue-100-allow-optional-auth-to-be-used-for-client-side-requests' into develop