Improve demo views

[bengolder]

Changes:

• Adds more ways to load and fake out data
• for the index view, GET /, it grabs a list of all the posted pdf forms, ordered from most recently filled to least recent filled.
• in the index view, if the Accepted header is JSON, it returns a JSON, otherwise it renders a template.
• adds a serializer for the listing of pdf forms.

[coveralls]

Coverage increased (+1.8%) to 95.039% when pulling 5b27542e10c3f9fd3f7086df52c8c70535658eeb on improve_demo_views into b2451060e64458137381ffc495637cdeb8c2c96d on master.

[coveralls]

Coverage increased (+1.4%) to 94.629% when pulling 652df5f61f4a719c9dfb2373b99d52867a19ed55 on improve_demo_views into b2451060e64458137381ffc495637cdeb8c2c96d on master.

[coveralls]

Coverage increased (+1.1%) to 94.388% when pulling 030f9da7f56441dfe3b3988b6b4218f7dbd75f81 on improve_demo_views into b2451060e64458137381ffc495637cdeb8c2c96d on master.

[coveralls]

Coverage decreased (-0.4%) to 92.84% when pulling 354790708948781636967f585ab3bdc35139573c on improve_demo_views into b2451060e64458137381ffc495637cdeb8c2c96d on master.

[bengolder]