Create Windows-compatible start script

If Windows is detected, a Windows-compatible .bat script is
generated. If a different OS is detected, the traditional bash
script is generated.
Fix a few issues with Windows script creation

There were a few linux-isms left in the Windows script
generation that showed themselves when the test suite was run.
Consolidated error strings into variables.
Fix tests to reference latest plugin version
Merge pull request #31 from jchab/master

Add Window-compatible start script generation