Reject disabled fields

[serverglitch]

Originally done by @samlown in #18. Separated the disabled field rejection into its own commit.

[sockmonk]

I would love to see this merged. Disabled input fields should not be serialized or submitted to the server.

[rhubarbselleven]

Hi @sockmonk can you expand on the usecase as to why disabled input fields should not be serialized?

[samccone]

I think the idiomatic thing to do is to not submit disabled fields

For example http://jsfiddle.net/00bqLtsp/

[rhubarbselleven]

Syphon is only to get you from form to object however. Submission is another beast.

I think the middle ground will be somewhere between here and #72

[samccone]

true true :) just leaning on the giants for some perspective

[rhubarbselleven]

Ah good point @samccone

[rhubarbselleven]

Hey @serverglitch would you mind opening this against the major branch? And could you fixup the failing tests please?