Start recording test coverage and move to ubuntu precise.

- We use coveralls.io to report on test coverage and avoid getting below a
  certain threshold. The threshold is currently 60%, but we will be increasing
  it when it stabilises.
- We use gcc/clang -ftest-coverage and gcov to measure C test coverage.
- We switched to container based Travis build infrastructure, which has the
  advantage of faster boot times[1] (1-6s vs. 20-52s). The trusty beta supports
  caching, but the longer boot times make it an unattractive target.
- We now need to build more dependencies ourselves and cache the result. We
  still fetch what we can (currently opam, libvpx, and check) from apt.

[1] https://docs.travis-ci.com/user/ci-environment/#Virtualization-environments

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