Update ruby-tilt to 1.3.4.
1.3.4 (2013-02-28)
* Support RDoc 4.0 (#168, judofyr)
* Add mention of Org-Mode support (#165, aslakknutsen)
* Add AsciiDoctorTemplate (#163, #164, aslakknutsen)
* Add PlainTextTemplate (nathanaeljones)
* Restrict locals to valid variable names (#158, thinkerbot)
* ERB: Improve trim mode support (#156, ssimeonov)
* Add CSVTemplate (#153, alexgb)
* Remove special case for 1.9.1 (#147, guilleiguaran)
* Add allows_script? method to Template (#143, bhollis)
* Default to using Redcarpet2 (#139, DAddYE)
* Allow File/Tempfile as filenames (#134, jamesotron)
* Add EtanniTemplate (#131, manveru)
* Support RDoc 3.10 (#112, timfel)
* Less: Options are now being passed to the parser (#106, cowboyd)
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