Add file for creating Titanic example data.
Tweak .travis.yml to install beautiful soup and six via conda, since they're available in there.
make_titantic_example_data.py actually works now.
Change write_feature_file to expect a directory followed by a file extension as path when passing in subsets dictionary.
Add workaround for potential issue with BeautifulSoup's UnicodeDammit choking on unicode input.