Remove trailing commas from field name.

Unfortunately with the current tests setup I couldn't get this to be replicated, but it doesn't break existing tests. Essentially, if you have a multiselect, radio group, etc. which relys on a foo[] naming structure,the error state doesn't get applied correctly.

This is because it's searching for "foo." instead of "foo", since it converts "foo[]" to "foo.", even though that is incorrect.

If someone can write some tests for this, it'd be great. But I can't seem to get it to call these functions in a test.
Merge pull request #228 from andrewryno/fix-validation-for-arrays

Fix validation for array elements (multiselect, radios, checkboxes) using the foo[] naming structure