version 1.5

* Added the function to authenticate, allow the user (with edit rights)
to use JSON API core controllers as well. Thanks `necro_txilok` for the
suggestion.
* Removed `clear_auth_cookie` for not doing what it intends to do,
instead `generate_auth_cookie` has been modified to allow setting up
auth cookie for any required duration. Just provide the `seconds` var
with `nonce`, `username` and `password` to get required cookie. Default
time is 14 days.
* Fixed typos in documentation.