Added searching for MBG data from mongo query.
hack: only consider 'grey' sgv records

Quick hack to force predictor to only use actual sgv records.
Merge branch 'release/0.4.0' into dev
add ability to easily id git rev-parse HEAD
Merge pull request #165 from nightscout/hotfix/pebble-sgv-string

Hotfix/pebble sgv string
Merge pull request #166 from nightscout/wip/id-rev

Wip/id rev
Merge pull request #128 from nightscout/wip/mbg

Added searching for MBG data from mongo query.
tweak toolbar and button size/placement
add script to prep release branch
quick hack to prevent mbg records from crashing pebble

Process would crash because mbg records would error when formatting
sgv to string.
Release notes for v0.4.1
0.4.1
Merge pull request #168 from nightscout/release/v0.4.1

Release/v0.4.1