Set working directory for Run Configuration to project root.
#44 Improve the syntax highlighting lexer a bit
Remove language injection into meta literals; this is already taken care of by the parser.
#44 Redo the syntax highlighting lexer: redo Ceylon.flex from Ceylon.g
#44 Handle string templates better
#44 Handle multiline comments better. Support up to 2 levels of comment nesting (temporarly workaround).