Updated gemspec with description
Ignored .ruby-version
Added a spec and a rake task to run it
Setting the API key when creating the API object
Sets XML as the default API response format
Support http_proxy env var
Use JSON API output, cleaner than the XML one
Now you can get_projects_and_boards

* Added Kanbanize::API#get_projects_and_boards
* Set up VCR and WebMock to easily test the API
Get the structure of a board
Refactored Kanbanize::API#initialize spec
Refactored Kanbanize::API#get_projects_and_boards spec
Get board settings
Get board activities
Login to API

* added #login method
* moved API key to an instance variable so it's independent of the class
* added a #post method as a wrapper around HTTParty::post so we can
insert the 'apikey' header there
Aesthetic change
Extracted proxy setting to its own provate method
Refactored URI encoding
Refactored API key setting