SubmitForm Bug Fix (GET Method, Issue #217, Optional attribute) [travis-ci ERROR Itself]

[Cow258]

Fixed thing

• GET method
  1. action attribute should be optional
  2. method attribute should be optional
  3. request.data should not repeat again after the end of the url query
• POST method
  1. action attribute should be optional
  2. auto replace (self.location.pathname + self.location.search) when action attribute is empty
• Support multipart/form-data for Issue Suggestion : enhance plugin with file upload support #217

GET method Issue Form tag HTML

<form id="form1" method="get">
    <input id="keyword" name="keyword" type="text" value="test"/>
    <input id="method" name="method" type="text" value="PlanA"/>
    <input id="ok" name="ok" type="submit" value="Submit">
</form>

Old Version

Url will be wrong!
smoothState will be crash!

https://localhost/undefined?keyword=test&ok=Submit&keyword=test&ok=Submit

New Version

Url will be correct!

https://localhost/?keyword=test&method=PlanA&ok=Submit

POST method Issue Form tag HTML

smoothState will be crash!

<form id="form1" method="post" enctype="multipart/form-data">
    <input id="keyword" name="keyword" type="text" value="test"/>
    <input id="method" name="method" type="text" value="PlanA"/>
    <input id="ok" name="ok" type="submit" value="Submit">
</form>