Merge pull request #33 from ericdill/csx_commissioning

WOO : First scan at csx
BUG : fix bug in align_against

Was not filling column before checking if all values were non-null
ENH : add a clear method to DataMuggler
Merge pull request #34 from tacaswell/align_bug

Align bug + clear
MNT: Replay talks directly to Channel Access
WIP: Working on direct PV access
WIP: Pushing so caswell can work on 2d images