Add Event model with unit tests
[#45] Add field password with validations and unit tests.

Add field password.
Add validation of type, presence and uniqueness of email.
Add validation of type, presence and confirmation of password.
[#45] Add format validation for email and unit test.
[#45] Clean-up: fix indentation.
Merge pull request #1 from gotar/user-model

[#45] User model with validations and unit tests.
Merge pull request #2 from gotar/event_model

Add Event model with unit tests
polish code formation
basic integration test for post user action
[49] changed password in User model to be hashed
removed unnecessary validation from User
Merge pull request #4 from gotar/hashed_password

[49] changed password in User model to be hashed
[#50] updated Gemfile
[#50] updated Gemfile
[#50] updated Gemfile.lock
[#50] meerge with maaster