Go Agent starts monit on startup

Signed-off-by: Nick Wade <nwade@pivotallabs.com>
actions need to unmarshal the payload again

because the arguments vary based on the method

Signed-off-by: Jesse Zhang <jz@pivotallabs.com>
[stemcell] document additional vagrant plugins required
Bump yagnats

Also changed all transport payload from strings to byte slices

Signed-off-by: Jesse Zhang <jz@pivotallabs.com>
Merge branch 'drnic-bosh-stemcell-docs' into develop