Change overwrite flag to boolean, clean up.
- Instead of passing -y or -n overwrite argument to Presentation.Downloader, used True/False
- Clean up debug statement
- Clean up unnecessary commented out code
Add Travis configuration file
Add test paths for nosetests
Remove Python 3.x testing for now
Run infoqscraper as a test
Merge branch 'overwrite-test' of https://github.com/hanxue/infoqscraper into overwrite-test