Improve code formating.
Add option to set permissions scope application-wide thru constructor.
You may provide an optional state parameter to `getLoginUrl` method to protect against CSRF.
Change `mergeScope()` method visibility from `public` to `private`.
Throw specific Exception instances instead of basic Exception's instance.
Update example.
Update version to 3.2.0
Merge branch 'dev' of github.com:Andreyco/Instagram
Update README