Fix build process

[int3]

From Reddit:

• I don't have discount installed, but markdown
• the gnu cpp requires -traditional-cpp to work while being raped in such a way.
• I have no clue what it put into third_party/classes. If you don't want to put that into you git (what i can understand) please add a script that downloads it. That helps alot. And if you don't tell me what i should put in there. (Java 4/5/6? does gnu classpath work? download link? What kind of file hierarchy is expected? Should they match the host's JVM or your JVM?)
• make fails, due to the lack of third_party/classes i guess. but surprisingly some stuff compiles. test/special/ZipRead.java:5: error: package com.sun.tools.javac.zip does not exist
• Also Coffeescript: In src/constant_pool.coffee, Parse error on line 157: Unexpected 'INDENT' In src/opcodes.coffee, Parse error on line 470: Unexpected 'FORIN'
• Also this strage 404: localhost - - [01/May/2012 01:18:27] "GET /test/special/Fib.java HTTP/1.1" 404

[perimosocordiae]

I think most of these concerns were addressed with the setup.sh script.