add pry-doc to gem
Add Rspec to Rakefile
Add user registration functionalities, improve http comunication

* add user registration function with test
* save response headers to http proxy object
* use attribute_set to convert to hash on EndPoint module
Update HTTParty, convert API request using JSON
Add update user feature, refactor user generation
Add sensor CRUD, add error classes, add response_headers to session, add launchy

* Abstract CRUD to EndPoint class
* Add Sensor Object to do CRUD
* add error class
* add response_headers to session
* add ability to export session http_response to file
* add ability to view in browser session http_response
Add SensorRelation to query sensor from commonSense
optimize sensors list, implement pagination test
add #last and spec for sensor Relation
fix default headers, fix user_management_spec update, use $user instead of CONFIG['CS_USER']
save! create! update! retrun true if success and false if not
move uri determination to instance method (get_url, post_url, put_url, delete_url)
wip
add SensorData functionalities
rename SensorRelation#get_sensor to get_data
Update end point for sensor_data
fix oauth parameter bug
fix oauth http method, fix sensor data relation
remove pry requirement
Refactor Relation Class & SensorRelation, add SensorDataRelation,