Fix authentication method

[12rambau]

the authentication and Initialization methods embed in the lib are made to simplify the use of GEE for multiple users or alternatively the same user connecting through multiple project.

The main idea is to store at the exact same place all the diferent credentials GEE could use and replace the one exisitng in earthengine/.credential when Initializing.

This method has become obsolete since version 1.x of GEE as the Initialize and Authenticate behaviour have vastly change. The mechnasim should remain the same but needs to be refreshed to be compatible with the current implementation of GEE.