Running a command through /usr/bin/env. Now we don't have to look for it in a specific place on the system, as those paths may be in different locations on different systems.
Merge pull request #285 from ymn/develop

Running a command through /usr/bin/env.

We probably don't care about it for the travis scripts, but my friends tell me that it won't hurt unless /usr isn't mounted, and, as a friend of mine said, "If you're doing abstract mathematics before /usr is mounted, you're doing something wrong anyway."