Merge branch 'release/0.4.1'
Merge branch 'release/0.4.2'
Merge branch 'release/0.4.3'
Merge branch 'release/0.4.4'
Merge branch 'release/0.4.5'
Merge branch 'release/0.5.0'
Merge branch 'release/0.5.1'
Merge branch 'release/0.6.0'
Merge branch 'release/0.6.1'
Merge branch 'release/0.7.0'
Merge branch 'release/0.7.1'
Merge branch 'release/0.7.2'
Merge pull request #32 from latestrevision/sync_to_execute

Switch .sync to also utilize common _execute interface.
Support datetime objects as input.

Add tests for datetime feature.

For #33.
Merge branch 'develop' of github.com:ralphbean/taskw into develop
Update the readme.
py3 compat.
Of course, handle unicode as well as byte strings here...
Test that unicode stuff.
Switch .sync to also utilize common _execute interface.