Fix build on wercker

Here is a long list of commits that fix the build on wercker. This is what I changed:

* Execute `go get ./...` as part of the build pipeline to discover package errors.
* Comment out the c.Redirect call, was causing build errors because the call is missing an argument.
* Fix some missing imports.
* Drop auth module from configuration.
* Build into `$WERCKER_OUPUT_DIR` instead of `WERCKER_SOURCE_DIR/build/acvte`. This directory is shared between the build and deploy pipeline.

Here is the green build that is related to this pull request: [acvte build on wercker.com](https://app.wercker.com/#build/521236c12fcd76d0570006c3). 

_Note: The reason the last build is failing is because I changed back the imports paths to your repository instead of my fork._