Offline / Online Transaction Signing is broken.

[brianddk]

It doesn't look like the code for $('#txSign').attr('disabled', false); exists anymore.

I can't find any code path or UI manner to enable the Re-Sign button

Test Case:

• Load brainwallet.org
• Select TEST for Testnet
• Click Transaction tab
• Type JSON transaction in Transaction box
• Note no JSON error... good
• Click Private Key textbox, enter private key
• Note address properly forms... good....
• Note Re-Sign button still grey... bad...

Also tried c9c9f16
at this revision, the Re-Sign button does enable when the private-key is input (good), but clicking the Re-Sign button blanks all the fields (bad)