Revert "Fixing Java 8 incompatibility caused by use of old jruby" because it breaks java 7 compatibility :(

This reverts commit 3c4c9c0.

Author: barancev

rake-tasks/crazy_fun/mappings/java.rb

@@ -319,8 +319,7 @@ def handle(fun, dir, args)
  :debug => true,
  :nowarn => true,
  :source => '1.6',
- :target => '1.6',
- :compiler => 'extJavac'
+ :target => '1.6'
  ) { |ant|
  ant.classpath(:refid => "#{args[:name]}.path")