Fixed regex that resulted in an invalid range in older browsers

The regex [_/-\s] is invalid as it creates a range between the
/ and the \s characters. The hyphen needs to be escaped or at
the end.

Author: jerel

addon/lib/system/inflector.js

@@ -3,8 +3,8 @@ import Ember from 'ember';
 var capitalize = Ember.String.capitalize;
 
 var BLANK_REGEX = /^\s*$/;
-var LAST_WORD_DASHED_REGEX = /([\w/-]+[_/-\s])([a-z\d]+$)/;
-var LAST_WORD_CAMELIZED_REGEX = /([\w/-\s]+)([A-Z][a-z\d]*$)/;
+var LAST_WORD_DASHED_REGEX = /([\w/-]+[_/\s-])([a-z\d]+$)/;
+var LAST_WORD_CAMELIZED_REGEX = /([\w/\s-]+)([A-Z][a-z\d]*$)/;
 var CAMELIZED_REGEX = /[A-Z][a-z\d]*$/;
 
 function loadUncountable(rules, uncountable) {