Update gemspec for 2.13.3.rc1 release
Update gemspec link to gemhome org
Add my email address since at least it's valid
Bump to 2.13.3 and spike minimal rake release task
Enable Travis CI builds
Add Rake test task (from Bundler template)
Rename test file according to Test::Unit conventions
Compile the C extension before testing

Compile with rake-compiler.
Make rake-compiler easily installable by `bundle install`.
Ignore all build artifacts (.gitignore from Bundler template).