made an attempt to add logic to follow a user, replaced test comment method with follow user method body instead. also added additional permission in InstagramEngine class for relationships.
Merge branch 'master' into pr/27
Minor changes from nick’s commit
test getSelfUserDetails
Merge remote-tracking branch 'origin/master'
Merge remote-tracking branch 'origin/master'
[FIX] Check if callback blocks exist and then only invoke them.

Takes care of cases such as `...failure:nil];`
Merge pull request #30 from dezinezync/Cleaner

Fixed nil errors
refractoring
Update README.md
Merge remote-tracking branch 'origin/master'
Initializing Created Date in media and comments
Update README.md
Update README.md
Merge branch 'relationships' of https://github.com/shyambhat/InstagramKit into relationships
Relationship endpoints
Relationship Status Endpoint
kRelationshipUserIsPrivateKey exposed
Restructured
typo