Merge pull request #5 from rychlis/master

Timezone-related issues
Updated information and improved examples for README

Also updated the license
Fixed casing syntax issue
Fixed incorrect info in README
Updated variable name in README to be more descriptive
Merge pull request #6 from firebase/python_token_readme

Updated information and improved examples for README
requiring UID in data, adding tests and updating documentation
generating shorter tokens
bumping version
Updating README
Merge pull request #7 from firebase/require-uid

v2.0.0