Optimizing the Dockerfile by installing deps first
Using new options struct for RunBuildSynchronously
Removing go get from Makefile (since it is redundant with deppy restore)
Update builder-core version to include date-based tagging
Adding some docs about using date-based tags, refreshing README

[ci skip]
go getting test packages before running tests
Merge pull request #164 from rafecolton/add-date-based-tags

Add date based tags