Merge remote-tracking branch 'ryanlower/master'
Release v 0.1.1
Use prefixed filename when adding sitemap file to index. Fixes #1
Merge pull request #1 from ryanlower/fix_filename_prefix

In 0.1.1, prefixed filenames aren't respected in the index file
Release v 0.1.2
Uncomment lastmod in the generator
Merge pull request #2 from academia-edu/lastmod

Uncomment lastmod in the generator
Require rake
Minor version bump
Use xmlschema for time instead of utc
bump to 0.1.4
Merge pull request #3 from academia-edu/lastmod

Use xmlschema instead of utc
Add capicue as author