add build images WIP: add build images rewrite validations
add build images WIP: rewrite main
add build images WIP: implement indirect (with a build image) builds
add build images WIP: extract utility methods
Cleanup
PEP8 fixes
Merge pull request #24 from kraman/build-images

PEP8 fixes
Add test golang app
Merge pull request #25 from pmorie/build-images

Add test golang app
WIP: add integration tests for build images
Merge pull request #26 from pmorie/build-images

WIP: add integration tests for build images
Changes to command line structure
Reorg of code in main function to match new arguments
Merge pull request #27 from kraman/build-images

Changes to command line structure
Flip RUNTIME/BUILD image argument order
Merge pull request #28 from kraman/build-images

Flip RUNTIME/BUILD image argument order
Fix indirect build
Merge pull request #29 from kraman/build-images

Fix indirect build
Update README
Merge pull request #30 from pmorie/build-images

Update README
Fix typo