Allow form submit when redirecting.

In login use case it is better to submit the form so browsers will ask
users to save theirs password.
That currently performs a double submit: the first one lets use Ajax to
do the first submit while the second one is only allowed through the
form. Obviously it is not a desirable behaviour and must be improved.
Allow a fallback to regular form submitting when javascript is not enabled.

Only login, signup, recover and reset password functionalities.
Allow a fallback to regular form submitting when javascript is not enabled.

In update password and customer data.
Anyway the form cannot be used when javascript disabled because there
is no automatic fallback for twitter's bootstrap tabs.
Clean up code and add some comments.
Fix width of address item.
Allow fallback to regular form submitting in cart functionalities.
Allow fallback to regular form submitting on address functionalities.
Remove JSON data always before generating web.
Implement code of first step on email verification on sign up.

Currently not activated due to SDK problems.