Merge pull request #12 from epmwgs/victorvilla_TK-02241_Task_Model

Victorvilla tk 02241 task model
Adding passwords to guidespark_users
seed.rb: Guidespark_user has passwords as in fb88bf6 mod
Introduccion Authentification & Authorization:
* Added the session controller
* New Login view
* Authorization on task controller
ENable the New Task buttons and actions only if is logged as writer
Using a better flash section
Mailer for VT on New Request
Mailer for Content-Ops on New Voice Request
Mail to Contentent Ops notifing acknowledge of new Voice Request
Fixing wrong voicetalent names
Mail to Content Ops on File Upload
Merge victorvilla_TK-02241_Task_Model into S-01814
Fixed business validations
Adding real emails