Merge pull request #12 from pdarden/emailing

Sendgrid and devise configuration
used shred-list.com for emailing instead of heroku
Use @shred-list.com in devise.rb
Friendly_id: url no longer uses user's id
Add posting created_at date to listing show page
Offer has many replies, and replies are private
Add map
Add google analytics
Merge branch 'messages'
Need to customize states labels
Changed search field to be in nav bar, sign in/up form looks better
Merge pull request #13 from pdarden/front-end

Front end
User has to sign in to make a listing
Take off select2 from pipeline
listing show page only show replies if they exist
Better background color for visibility
Merge branch 'front-end'
Fixed equipment image error
Fix fallback image on index page
Fix layout for user's offers and listings pages