Implement e-signature

[lippytak]

• Remove current jSignature code
• Replace signature view with form inputs for name and 'agree' checkbox
• Add migration
• Save signature data to the DB (name, checkbox status)
• Print signature to CF-285
• Print signature to ROI
• Write tests
• Update cover page to explicitly address that the sig may look weird but it's valid
• Review with Leo
• Rebase and PR

Research: #326

Working on: https://github.com/codeforamerica/clean/tree/e-signature

[lippytak]

^ updated with the steps to implement

[daguar]

Maybe we review with Leo first? Based on current level of EW confusion, I think it makes sense to check in first before putting in the effort — it may change the requirements.

How did the Intuit applications deal with this, btw?

[daguar]

Moved this to current sprint — Jake, are you doing the front end stuff here or am I? I know some of the backend stuff I need to do, so let's just touch base and break out into separate issues if necessary.

[lippytak]

Will be working on here: https://github.com/codeforamerica/clean/tree/e-signature. All I've done so far is delete all the jSignature remnants.

[daguar]

I rebased against master, so the e-sig working branch now has all the backend storage work in it.