introduce a way to set a default path for the exec used by this module.

This addresses #2, #3, #11, #21 & #22 without being intrusive about a
global path for exec.
linting
one shall not mute puppet values, they are immutable
documenting the new feature
txt linting
release 0.0.2
release v0.0.3
Update to accept all BSD kernels.  Add spec tests.
Merge pull request #24 from decibelhertz/master

Update to accept all BSD kernels.  Add spec tests.
add travis-ci
add status
version 0.0.4