don't show subject for replies; fix reply body errors

use object literal to extend Backbone view - fixes shared private property problem; expand reply composer on click

basic IMAP reply drafts added

use backbone $ selector; fix submit button text; disable reply drafts

show reply to/cc/ccList correctly

fix attachments for new messages and replies

enable reply drafts again

fix concurrent view events

fix deletion of previous reply drafts

generic reset, send and draft

adapt classes/IDs

rename file

fix html classes

fix CSS selectors

fix cc/bcc toggle; fix travis errors

add draft UID; fix missing BCC

centering new email account form horizontally and vertical adjustments also

This is a combination of 6 commits.
centering the <new email> form

stupid error in blind css

changing the structure of the markdown arround  <new email> form for it to be included into the #app-content div, and therefor it can be centered while keeping absolute positionning, in respect with the rest of the cascading css structure of the app

CSS adaptation of the new email account form

adaptation of the css structure now that content is truly relatively positionned; removes a bit of top margin to now have scroll in the form on small heighed screens

switching to a cleaner aligning method

now adding padding to the top to 'center' the form vertically

also centering the loading.gif to the form, forgot to do so.

syntax correction based on Codacy

fixes #726

Fixed white space rendering for the message list within the Gecko web browser engine.