This PR adds a `mach install` command (a convenient way to run `adb install`), and does some minor code cleanup.
It also fixes parallelism in the OpenSSL build. For [complicated reasons][1], a sub-Make will not inherit `-j` options from its parent process unless it is invoked directly from another Makefile. This means we should run make from openssl.makefile rather than openssl.sh.
r? @larsbergstrom
[1]: http://make.mad-scientist.net/papers/jobserver-implementation/
Source-Repo: https://github.com/servo/servo
Source-Revision: a1fb12616a29d2190baadd20d7763af1d9c02260
Matt Brubeck