yaml config and yaml_load
pep8
options modal;
back button from the app;
http interceptor (in case of errors)
app page
bumped docker-py version to 0.3.2
Simple running of steps and image committing seem to work.
Merge branch 'devel' into feature/ci
more blind handlers
Working example

Example of creating a build environment image, and using this image to
build bedtools toolkit, then installing this toolkit to clean image.
compass version
extract utilities
mock builds
Subcommand for build

`rabix-sdk build` will run steps from given config file
(`.rabix.yml` by default)
Merge branch 'feature/sdkbuild' into feature/ci
Actual build cmd and status update