Test that we can repr a carray with datetimes
Fix repring of datetime64 carrays
Add 0.7.3 release note entry
Add test case to a class
Test different frequency
Pass unit into datetime64 constructor
Merge pull request #99 from cpcloud/datetime-repr-bug

Fix datetime carray repring
acknowledge the contribution
use docker containers when building on travis

Adding the single line as documented on:

http://blog.travis-ci.com/2014-12-17-faster-builds-with-container-based-infrastructure/
run the full test-suite on Travis