New parser
Fixed exceptions
Get avaiable methods to export them
refactor runtimes
refactored lib
Merge remote-tracking branch 'dg-vrnetze/feature/parser' into feature/parser

Conflicts:
	lib/proxy_pac_rb/file.rb
	lib/proxy_pac_rb/runtimes.rb
	lib/proxy_pac_rb/runtimes/rubyracer.rb
	tmp/script.rb