Adding grunt step to CONTRIBUTING.md
Merge pull request #405 from rashidkpc/master

Adding grunt step to CONTRIBUTING.md
Merge remote-tracking branch 'spencer/zero-filled-ts' into spencer-zero
Fixed subsecond intervals in interval_to_seconds
Merge pull request #414 from rashidkpc/master

Zerofill tweaks
squashing merge
Merge pull request #418 from rashidkpc/fix

Bringing the rest of spencers changes in
Merge branch 'master' into zero-filled-ts
Ensure that the "required_times" is always unique to prevent strange results and non-uniform data-sets