Merge pull request #3 from AlexBaranosky/master

Added a today at midnight fucntion, however
Merge pull request #4 from AlexBaranosky/master

minor bug fix, and a some unit tests
Snapshot for 0.3.3
0.3.3 release.
Fix #5 by reverting in-msecs to avoid ArithmeticException.
Period functions now return identifiable types
New functions for checking the types of Periods
Renamed seconds? to secs? for consistency
Added tests for the new type test functions
introduces lein-multi to test for 1.3 compatibility

To use run `lein plugin install lein-multi 1.1.0`
and then `lein multi test`
Merge pull request #9 from bmabey/master

use lein-multi to test for compatibility against multiple clojure versions
add the ability to create a formatter that can parse multiple date formats
updated the documentation
Merge pull request #7 from aviflax/master

Change period funcs to return identifiable types, add funcs for checking types
Merge pull request #10 from dennisroberts71/master

Support for date formatters that can parse multiple date formats.
Fix up dependencies for lein multi testing
Change how multi formatter is built to resolve parsing bug
0.3.5 version
Start 0.3.6 (snapshot).
Enable Travis.