Merge pull request #51 from wbollenbacher/master

VEL3D (Nortek) Added probe_check data particle.
Merge pull request #52 from wbollenbacher/master

VEL3D (Nortek) Added setting of internal timestamp in particles.
Merge pull request #53 from wbollenbacher/master

corrected bug in probe_check data particle tests for VEL3D (Nortek)
Merge branch 'master' of github.com:ooici/marine-integrations
added unit test for status data particle