Remove name option and mount at unique context; fixes #15
Activate :test profile
Include :default profiles, too.

I suspect we'll eventually want to be more flexible here eventually,
honoring with-profile invocations and possibly supporting
test selectors, but let's cross that bridge later.
Warn if given a path argument inside a project [issue #14]
Update deploy-tools and leinjacker deps.
Print an error message when given a non-existent path [issue #17]
Update to real deploy-tools release and the latest nrepl.
Use the version argument with overlay