Fix "form.submit is not a function" error

If a form has an input named `submit` it will overwrite the forms
submit function with a reference to the element. Calling it right
from the class and passing the instance fixes this issue.

Author: codingjoe

s3file/static/s3file/js/s3file.js

@@ -22,7 +22,7 @@
         waitForAllFiles(form)
       }, 100)
     } else {
-      form.submit()
+      HTMLFormElement.prototype.submit.call(form)
     }
   }
 

setup.py

@@ -3,7 +3,7 @@
 
 setup(
     name='django-s3file',
-    version='3.0.1',
+    version='3.0.2',
     description='A lightweight file uploader input for Django and Amazon S3',
     author='codingjoe',
     url='https://github.com/codingjoe/django-s3file',

tests/testapp/templates/form.html

@@ -13,7 +13,7 @@
 <form method="post">
     {% csrf_token %}
     {{ form }}
-    <input type="submit" value="Submit Form"/>
+    <input type="submit" name="submit" value="Submit Form"/>
 </form>
 {{ form.media.js }}
 </body>