Add support for coffee-script 1.6 error format

coffee-script 1.6 changes the error output format. An error that would look like the following under coffee-script 1.4:

    SyntaxError: In lib/www_routes.coffee, unmatched ) on line 53
        at SyntaxError (unknown source)
        at Lexer.exports.Lexer.Lexer.error (/usr/local/lib/node_modules/coffee-script/lib/coffee-script/lexer.js:682:13)
        at Lexer.exports.Lexer.Lexer.pair (/usr/local/lib/node_modules/coffee-script/lib/coffee-script/lexer.js:634:16)
        at Lexer.exports.Lexer.Lexer.pair (/usr/local/lib/node_modules/coffee-script/lib/coffee-script/lexer.js:638:21)
        at Lexer.exports.Lexer.Lexer.pair (/usr/local/lib/node_modules/coffee-script/lib/coffee-script/lexer.js:638:21)
        at Lexer.exports.Lexer.Lexer.literalToken (/usr/local/lib/node_modules/coffee-script/lib/coffee-script/lexer.js:456:16)
        at Lexer.exports.Lexer.Lexer.tokenize (/usr/local/lib/node_modules/coffee-script/lib/coffee-script/lexer.js:33:220)
        at Object.exports.compile.compile (/usr/local/lib/node_modules/coffee-script/lib/coffee-script/coffee-script.js:47:32)
        at compileScript (/usr/local/lib/node_modules/coffee-script/lib/coffee-script/command.js:182:33)
        at fs.stat.notSources.(anonymous function) (/usr/local/lib/node_modules/coffee-script/lib/coffee-script/command.js:152:18)

now looks like this under 1.6:

    lib/www_routes.coffee:53:9: error: unmatched )
            ), done
        ^

resulting in CoffeeMake not properly parsing the error for display in quickfix windows and such.

This commit adds the syntax line for 1.6 to support parsing the new format.