Check text of the exceptions that are thrown
Use "should include" for string matching
Fix off by one bug, lots of debug code
remove debug code
Merge pull request #28 from hammerlab/check-exceptions

More tests for SlidingWindow
Add a test for halfWindowSize=1
Merge pull request #29 from hammerlab/hws=1

Add a test for SlidingWindow with halfWindowSize=1
rebase off master