Reverse lib in tests, because rake already requires set and ostruct
Enumerable#each_with_index(*) is not a feature of 1.8.7! Move to 1.9.1
Fix loading checks for String#upto, Math.log(base) and Regexp.union
+ Test that only the right features are required
Tweak test
+ Travis setup
v3.0.3: Some backports were loaded when it was not necessary