Fixed warning & updated to CocoaPods 0.34.2
Object to find connection from email domain.

Added ObjectiveSugar dependency for easier collection manipulation.
Rolled back cocoapods update due to intermitent build issues.
Add constants with strategy names.
Add method to fetch enterprise strategy by connection.
Fixed poorly tested feature.
Hide password when enterprise email is entered.
Enterprise login screen for AD connections.

Add connection name for AD when calling /ro.
For non-AD conneciton, start web flow.
Avoid issues when auth params are nil.
Refactor domain matchers.

Created protocol for domain matcher and 2 impl: one base and another one that
filters strategies by name.
Handle AD or Enterprise only login.
Handle AD only Logins.
Fix Keyboard issue.
Option to parse AD email and get the username.

Email's local part is used as username in AD login screen.
Fix issues when validating AD login credentials.
Fix issue when connection domain is 'null'.
Merge pull request #35 from auth0/feature-enterprise-authentication

Enterprise Authentication