Add the ability to format RSpec output as Nyan Cat

Run RSpec with this option:

--format NyanCatFormatter

Add this option to ~/.rspec file to always use it.

About:

http://knowyourmeme.com/memes/nyan-cat-pop-tart-cat
Run WEBrick locally instead of Unicorn

Unicorn is tricky: you need to tell it to write
a pidfile to kill it later. Too hard to do it on
a development machine; not worth it.
removed excessive validation, corrected tests
Merge pull request #43 from monshq/feature-42-error-msg-duplicated

Мы посовещались и решили, что можно оставить только одно сообщение об ошибке при незаполнении контактной информации.
Enforce RSpec documentation formatter

To encourage developers to write descriptive spec titles