Move build token into app configuration
merged branch rbayliss/build_tokens_app (PR #98)

This PR was merged into the master branch.

Commits
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8ee8999 Move build token into app configuration

Discussion
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Move build token into app configuration

Currently, controllers.php uses getenv() directly to get the build token.  This makes it hard to override, and awkward to test.  Why not put specify the token in app.php?  This pull request continues to use getenv(), but moves the definition to app.php.