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MOBILE API SUMMARY
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Details:
* api_ prefix, maps to specific function.
* _(), maps to URLs.
* response are json.
* each api call need clientID and accessToken (except first call of api_init)
* SecretKey is given on client registration, used for signature/validation 
  process and never passed through network. store the SecretKey.
* accessToken is given on client registration, used to authenticate user loged in.
  should be stored and updated after login/logout process.
* request are signed, unless not specified with a `signed` keyword.
* api.php, central entry for all request

API usage example in main.py

Execution example:
$ python main.py

Requirements:
    python 2.7

Dependencies:
    requests 0.11.1