Updates for dashboard - version 0.3

Adding some features to create dynamically tasks
dashboard. Allowing tasks mail to create granular objects.

Commit dashboard v0.1

Adds proper time schedule with proper attribute.
Change of schema to adapt to this change.

Each cells of tasks management report informations.
Not proper ones yet, but it is a start.

Add users selection for mail task as well as schedule within
generic page of tasks creation.

Adds management required columns, back processing still has to be
developped

Simple commit of the management and two sub class creation.

Mail Attachment is now being processed properly.
Upload and download are available

Basic mail template object created with required fields.
Next steps is file attachment processing.