Create new pet

[dmzza]

TODO

• Render the pet being edited on pets#edit
• Redirect pets#update to pets#edit instead of pets#show
• Submit the pets#edit form immediately after choosing a Shape or Color
• Remove the submit button from pets#edit
• Design pets#edit with the rendering of the pet on the left half, and the form on the right half

Optional

• Remove radio buttons. Shapes and Colors should be bare clickable elements
• Use javascript to submit the form instead of reloading the page (same as Refresh selection without reloading page #7)

Todo for @dmzza

• Generate Chubbyy's lucky number in the Pet model
• Create a deep-link to the iPhone app for the lucky number