Bumped version to 2.16.0 (firebase#265) 

Bumped version to 2.15.1 (firebase#253) 

Bumped version to 2.15.0 (firebase#251) * Bumped version to 2.15.0 * Updated changelog

Bumped version to 2.14.0 (firebase#230) 

Bumped version to 2.13.0 (firebase#194) 

Bumped version to 2.12.0 (firebase#181) * Bumped version to 2.12.0 * Updated changelog

Bumped version to 2.11.0 (firebase#174) * Bumped version to 2.11.0 * Removing redundant whitespace

Bumped version to 2.10.0 (firebase#153) 

 Bumped version to 2.9.1 (firebase#137) * Bumped version to 2.9.1 * Changlog updates * Changlog url * trigger cla check

Bumped version to 2.9.0 (firebase#129)