Add edit button to seeds index page

https://www.pivotaltracker.com/n/projects/646869/stories/53958137
Increase devise timeout to 30 days
Removed edit profile button from home page

Added yoongkang to the contributors list

Feature test for edit profile button on homepage
Merge branch 'dev' into editprofile

Conflicts:
	CONTRIBUTORS.md
Merge pull request #449 from Skud/login_timeout

Increase devise timeout to 30 days
Add test to new edit seed link
Changed staging environment hostname to staging.growstuff.org
Remove old capistrano stuff, as we don't use it anymore
Prevent the creation of a garden with a negative number for the area.  If entered, the area must be greater than or equal to zero.
Added a test for the validator to show it doesn't accept negative numbers for garden area.
Merge pull request #441 from yoongkang/editprofile

Removed "Edit Profile" button from home page
Merge pull request #447 from krio/add-edit-button-seeds-index

Add edit button to seeds index page
Merge pull request #450 from Skud/login_timeout

Login timeout
Merge pull request #452 from wsmoak/negative-area

Prevent the creation of a garden with a negative number for the area.