Merge pull request #1 from deverett/master

Serial Capability in Port Agent.
Updated break command to use default break duration if not specified.
updated port agent config to use a default break duration if one is
not specified.  This aligns a little better with the ICD
updated logger to it is behaving as a singleton object again when
writing
changed some defaults to more reasonable numbers.
Release Version 0.1.5
Bump Version to 0.1.6-dev
Added sleep if open fails for serial device path; noticed that
CPU was 100% if this wasn't there, and the device path doesn't
exist.