cleaned up user and tests
added group caching to cookie and local storage
cleaned up public-facing user api
made sure traits and user id are always loaded from cookie, fixes #214
allow identify(traits, options) override, fixes #147
updated group to mimic cleaned up user
updated #group to call group.identify
bind all analytics methods, fixes #186
cleanup cookie tests
cleanup store tests
cleanup core tests initialization
cleaned up all the core tests
merged cleanup core branch, 0.14.0