Start of sandbox for post-install scripts.
Add a log message at start of create command.

Although a seemingly small change, this ended up being a small to medium
refactor.
Parameterise Groovy version in build and upgrade to 2.1.5.
Fix minor typo in comment.
Fix handling of empty user config file.

Lazybones was assuming that if a config file existed, it specified the list of
Bintray repositories to search for templates. This wasn't the case and most of
the commands errored out due to there being no repositories configured.

Lazybones now sets a default repository list if the user hasn't set one him- or
herself, regardless of whether the config file exists or not.
Add Luke and Tomas as contributors.