fix(waitForAngular): when timeout overflows, at least pass the negative to error messages

Closes #622

Author: juliemr

lib/protractor.js

@@ -572,13 +572,13 @@ Protractor.prototype.waitForAngular = function() {
       var timeout;
       if (/asynchronous script timeout/.test(err.message)) {
         // Timeout on Chrome
-        timeout = /[\d\.]*\ seconds/.exec(err.message);
+        timeout = /-?[\d\.]*\ seconds/.exec(err.message);
       } else if (/Timed out waiting for async script/.test(err.message)) {
         // Timeout on Firefox
-        timeout = /[\d\.]*ms/.exec(err.message);
+        timeout = /-?[\d\.]*ms/.exec(err.message);
       } else if (/Timed out waiting for an asynchronous script/.test(err.message)) {
         // Timeout on Safari
-        timeout = /[\d\.]*\ ms/.exec(err.message);
+        timeout = /-?[\d\.]*\ ms/.exec(err.message);
       }
       if (timeout) {
         throw 'Timed out waiting for Protractor to synchronize with ' +