Merge pull request #19 from pmorie/test

Add test for incremental build, refactor test code
Change 'run' scripts to use 'exec'
Merge pull request #20 from pmorie/run

Change 'run' scripts to use 'exec'
Fixed missing port in README.md example
Added support for GIT repository to be the source_dir
Merge pull request #21 from mfojtik/readme_fix

Fixed missing port in README.md example
Merge pull request #23 from mfojtik/git_support

Added support for GIT repository to be the source_dir
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