Merge pull request #18 from jdelight/master

Fix travis build
Merge pull request #19 from jdelight/master

Update README.md
Only build the master branch on travis
Add reference to target element on picker
Update time picker
Fix singleDate mode with time support
Add methods to access the time picker
Merge pull request #20 from jdelight/add-reference-to-target-element

Add reference to target element