[66] added index action for events
corrections in tests
Merge pull request #26 from gotar/index-event-action

[66] added index action for events
Add uniqueness of email validation error. Update Readme.

API will return HTTP 409 and `'message' => 'User created successfully'` if email in params is not unique.
Update create user spec.

- Add contexts.
- Add test for not unique email address and JSON format.
- Update tests with JSON messages.
Merge pull request #30 from gotar/user-create

Update user create action
limit access
[#66] Fix calendar.rb for merge