dockerfile language pack

* Language pack to support git repos with a Dockerfile
* fixes to handler / builder to pull source format
     from Planfile
* updated db schema to allow for longer strings for
     source_format
* example planfiles for docker-registry and mysql
* change application.(\w+) to $1 in Planfiles

Change-Id: Icc3704b5bf8f57706290fb986f1c93f09c5d79bc
Merge "dockerfile language pack"