BF better way to import pyo within sound.initPyo (as a global)
TEST microphone.py tests

- mark as needs_sound for travis
- small fixes to microphone.py
TEST skip microphone tests if no flac installed
TEST flac_path for travis
TEST skip flac_path
TEST flac with travis
TEST skip microphone tests for travis

- mark as needs_sound (not 100% certain this is the issue, but it excludes the tests)
TEST travis "export AUDIODEV=null"

- stackoverflow suggests that might be possible to fake sound on travis
  using "export AUDIODEV=null" or snd-dummy (like xvfb can fake visual)
TEST revert
Merge pull request #400 from jeremygray/master

test microphone.py (but no-go on travis-ci)