Bumped version to 2.7.0 (firebase#106)

Bumped version to 2.6.0 (firebase#102)

Bumped version to 2.5.0 (firebase#92)

Bumped version to 2.4.0 (firebase#76)

Bumped version to 2.3.0 (firebase#68)

Bumped version to 2.2.0

Bumped version to 2.1.1 (firebase#52)

Bumped version to 2.1.0 (firebase#41)

Updating README (firebase#25)

* Updating README

Bumped version to 1.0.0 (firebase#16)

* Bumped version to 1.0.0

* Fixed typo in docstring