Fix comments that describe usage of UserCollectionProxy
Include Enumerable module into UserCollectionProxy instead of defining map
Fix typo/whitespace in User class comment
Add Intercom::User.count method to fetch total number of users
Remove Intercom::UserCollectionProxy#count (clashes with Enumerable#count)
Add example to comment for Intercom::User.count
Add new Intercom::UserCollectionProxy#count method
Merge pull request #7 from timcraft/user-collection-proxy-fixes

User collection proxy fixes