Merge pull request #31 from alexspot/develop

added unit tests for bin/howitzer
created mailgun_helper_spec.rb and mailgun_spec.rb files
tests for loaded libraries in mailgun_spec.rb
adding context to mailgu_helper_rspec.rb
Done tests for create_mailbox method
Small fixes on require libraries
Tests added to helpers_spec.rb
refactored helpers_spec.rb
Merge pull request #33 from trofymenko/develop

[TA] Cover /lib/howitzer/helpers.rb by tests
Merge pull request #32 from alexspot/develop

added unit tests for lib/howitzer/settings.rb
Merge pull request #34 from alexspot/develop

added unit tests for generators/*.rb
Merge pull request #35 from alexspot/develop

fixed rake tasks
developed email_spec.rb
made code convention refactoring in email_spec.rb
Tests added to data_storage_spec.rb
refactored data_storage_spec.rb
Merge pull request #37 from trofymenko/develop

Tests added to data_storage_spec.rb
improved code (syntax only) according to 'code conventions'
added double-indentations in few blocks of code
deleted some ugly code-indentation (with 'end' mostly) according to 'code convention'. Hope it`s final commit.