Allow expressions as keys in an object

[csimi]

From the twig php docs:

{# keys as expressions (the expression must be enclosed into parentheses) -- as of Twig 1.5 #}
{ (1 + 1): 'foo', (a ~ 'b'): 'bar' }

[xphere]

Hi! Any news on this one? 😄

[plepe]

Hmm, I tried to merge this pull request on the current master and got the following exception when running make test (for the test which was created in this pull request):

Error compiling twig template undefined: 
TwigException: Unexpected value before ':' of Twig.expression.type.parameter.end = )
Error parsing twig template undefined: 
TypeError: Cannot call method 'forEach' of undefined
    at Object.Twig.forEach (/home/skunk/public_html/twig.js/twig.js:79:24)
    at Twig.parse (/home/skunk/public_html/twig.js/twig.js:576:18)
    at Twig.Template.render (/home/skunk/public_html/twig.js/twig.js:949:29)
    at Context.<anonymous> (/home/skunk/public_html/twig.js/test/test.core.js:120:58)
    at callFn (/home/skunk/public_html/twig.js/node_modules/mocha/lib/runnable.js:223:21)
    at Test.Runnable.run (/home/skunk/public_html/twig.js/node_modules/mocha/lib/runnable.js:216:7)
    at Runner.runTest (/home/skunk/public_html/twig.js/node_modules/mocha/lib/runner.js:374:10)
    at /home/skunk/public_html/twig.js/node_modules/mocha/lib/runner.js:452:12
    at next (/home/skunk/public_html/twig.js/node_modules/mocha/lib/runner.js:299:14)
    at /home/skunk/public_html/twig.js/node_modules/mocha/lib/runner.js:309:7
    at next (/home/skunk/public_html/twig.js/node_modules/mocha/lib/runner.js:247:23)
    at Object._onImmediate (/home/skunk/public_html/twig.js/node_modules/mocha/lib/runner.js:276:5)
    at processImmediate [as _immediateCallback] (timers.js:330:15)

Could you please have another look at it?

[plepe]

replaced by #284