If the user hits the /signin or /forgot pages while signed in, redirect them to the "/" page.

close #1345

only Firefox seems to make the placeholder text
be the same color as the normal text, so this will
set the placeholder to a lighter grey

fixes #2187

Usability enhancements to the forgot password screen.

* Disable the email field.
* Focus the first password field instead of the email field.
* If no email is stored (user did not come from /signin or /signup), redirect the user to /signin.
* If email address that is stored is not known, redirect to /signup.
* If email address that is stored is known but a primary, redirect to /signin
* When calling User.addressInfo on a primary address, check whether the address is known or not.  Allows us to simplify the forgot page.

Issue 2120 combine signin signup pages into /signin

Send html versions of emails

always set currentHint to null at startup

r+

Thanks @seanmonstar!

close #2132

* Remove the 250ms animation time.
* Update/fix unit tests.

process.env converts all values set into strings,
so its better to just not set it.

fixes #2132

Give the Persona window the name __persona_dialog when opening. 

Thanks @lloyd, I removed the unused paths.

close #1023

Give the Persona window the name __persona_dialog when opening. Useful for Selenium tests which need an easy mechanism to get a handle to the window being tested.

upgrade data formats

@benadida - With your check for only one of 'public-key' or 'publicKey', I am comfortable with this change.  Thanks for being patient while I learned a bit more about jwcrypto and the BrowserID spec.

r+

* Slide the password fields down whenever they are shown.
* Add slideUp/slideDown, fadeIn/fadeOut to dom-jquery.js

* Remove the signup page and all remnants of it.

Set a max length of URLs and URL paths.

close #2080

Log additional verifier assertion errors, where assertion or audience could not be found.

r+

@zaach - thanks for the update, looks good.

Fix typo in primary logging

r+

Thanks @callahad

* If the user types in a known secondary, redirect the user to the signin page.
* If the user manually clicks the "new to persona?" or "Existing account?" links, clear the stored email address.