Alphabetized Ruby books
Fixed alphabetization of Ruby Books

Titles leading with "The" are ignored.
Spaces have precedence over letters
Alphabetized Ruby books

Ordered like a dictionary A-Z. Removed duplicate (http://humblelittlerubybook.com/book/)
Updated Ruby Books

Deleted tryruby.org since it is available in the interactive file
Merge pull request #650 from gabriellim/patch-7

Alphabetized Ruby books