[#62] Add show action for user, update Readme.
Clean-up: use json_answer method for JSON messages.
[#62] Clean-up, add method for JSON errors.
Merge pull request #20 from gotar/user-show

[#62] Show action for user
return everything as a JSON with message
[54] added destroy action for event
Merge pull request #22 from gotar/event-destroy

[54] added destroy action for event
login action
current user
[66] added index action for events
[#53] Fixed tests.

- user index
- user show
- event create

Broken in b81cfe.
Merge pull request #27 from gotar/tests-fixed

[#53] Fixed tests.
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
fixed tests
Fix test for user show.