add session to find_or_new method
add duplicate method to end point
add user relation, change retval of end point, chenge session

* end point will now return false if error instead of nil
* add user relation
add basic group functionalities
inspect return list object on relation
remove pry stack explorer
Create a CS::Time that wrap Time object from ruby, activesupport or TimeLord
(Failing test) add webmock, Mock actual HTTP request
save, create and update call receive hash as parameter to be merge with params
remove binding debug call
Fix user feature, remove create user on first API call
Fix sensor data feature
remove trailing spaces
fix sensor_management_spec and fix bug on retrieve
clean up spec_helper
fix bug on Time.now
fix bug on retrieve! on sensor class
Fix session spec
fix cs_spec lib
fix pagination test on sensor_management_spec