Update selenium to 2.53

[xael-fry]

[gslowikowski]

BTW, you can fix the bug, I reported here https://groups.google.com/forum/#!topic/play-framework/iUOysRVpJwg.

Before Play! 1.3.0 original selenium-api.js was modified to use square brackets for variables, because Play! would try to resolve all variables in braces when rendering Selenium test template:

    var match = stringResult.match(/\$\[\w+\]/g);

Check source.

After the change this fix was accidentally removed:

    var match = stringResult.match(/\$\{\w+\}/g);

and since then variables in Selenium tests didn't work. Check source

Please, restore it now.

[xael-fry]

Issue created for this issue #988

[xael-fry]

Done in PR #989