Machine-readable output for getting lab hours

[dkess]

The lab hours API returns hours as a string ("11:00:00") which is annoying to parse, especially in Javascript (for the labmap). We should perhaps write a new function that does this split for us. See https://github.com/ocf/labmap/pull/4#issuecomment-456689205

[jvperrin]

@dkess++ thanks for making this a separate issue