2.3.0
Initial commit in public git history for 3.x line of Braintree iOS SDK.
Bump pod version to 3.0.0-rc1
Fix description for docs Rake task
Fix typo in hockeyapp distribution rake task
Update Rake release task to push to github.com
Replace 'Beta' with 'Release Candidate' to match version tag
Update README.md

Typo
Update CHANGELOG to rc1
Add CONTRIBUTING.md, fix README links
vt Yl4jOP9d - Add to existing payment methods
vt iCJsu9iX - Change all internal #imports to use "'s
vt Tzcldegq - Call only failure delegate methods if paypal view controller fails
vt GCj6dZ23 - Pod try "Braintree" rather than "braintree-ios"
vt WHz9fe4b - Reduce BTPayPalControl, rename BTPaymentMethod subclasses

* Remove state changes in `BTPayPalControl`, add delegate method
* Rename `BTPayPalAccount` -> `BTPayPalPaymentMethod`
* `BTCard` -> `BTCardPaymentMethod`
* Update docs accordingly
* Also add BTPayPalControl delegate method for `payPalControlWilLCreatePayPalAccount`,
  useful for UI updates.
Remove 'Table' from BTDropInSelectPaymentMethodTableViewController name

The fact that it is a UITableViewController is incidental, so need not
be indicated in the class name.
Add release:assumptions to start of release task
project - Remove unused resource Bundle from Braintre-UI
Merge remote-tracking branch 'public/master'
Add publish namespace and task to Rakefile