Building docker images without shelling out!
Catching an error when path to Dockerfile is not sanitary
Using the correct ContextDir for builds

...by passing the `BuildCmd` the `builder.Workdir` as the `ContextDir`,
replacing the default of `.`
Use full path to gox in Makefile
Remove unused function
Merge branch 'fix-server-failure-if-no-basic-auth-provided' into docker-build-without-shelling-out
Merge branch 'fix-server-failure-if-no-basic-auth-provided' into docker-build-without-shelling-out
Merge branch 'fix-server-failure-if-no-basic-auth-provided' into docker-build-without-shelling-out
Add support for new x-registry-config header
Fixing tests given the change to build with the go-dockerclient
Merge pull request #133 from rafecolton/docker-build-without-shelling-out

Building docker images without shelling out!