refactoring signup component
 — created file-upload directive with all needed staff
 — removed content from controllers
 — configuring of nextSteps was moved to config/join.js
 — ModalControllers were simplified
refactoring signup component
— added factory to signup object
— simplified controllers
— fixed crazy validation of start form
— used nested views for confirm and done steps to avoid duplicity of content
Merge pull request #1 from glebv/dev

Glebv is the bomb.