Patch generic apis

[GaPhi]

Fixes #311.

Changes proposed in this pull request:

• Add low level Tesla get/post API that manage Authentication header
• Add low level Tesla vehicleGet/vehiclePost API that manage Authentication header and vehicleID part of the URL
• Add command parameters to all API calls with a "args" object
• Add query string parameters to get/post API calls with a "qs" object

This could break a little the compatibility with previous version (then tag 4.11.0 proposed) but should not be the case anymore for future versions.