release 1.5.0 (messagebird#50)

Merge pull request messagebird#36 from messagebird/update-travis-config

Update travis-ci matrix to use Python 3.4 istead of Python 3.3.

Merge pull request messagebird#34 from sarathsp06/master

add support for create MMS

Merge pull request messagebird#26 from messagebird/add-long-description

Add long_description to setup.py based on README

Merge pull request messagebird#24 from messagebird/bump-version-130

Bump client version to 1.3.0.

Merge pull request messagebird#12 from messagebird/fix_mutable_defaul…

…t_value

Fix mutable default value with sentinel

Bump the version to 1.2.0

Bump the version to 1.1.1

Bump the version to 1.1.0

Bump the version to 1.0.3