Use asset URL instead of index when deleting photo

Fixes #28
Use correct key in KVO for 'use multiple novas' setting
Remove grid lines & square photos from settings
Disable custom flash mode in SSNovaFlashService

Flash settings view controller checks SSNovaFlashService to
determine whether the "Custom" flash settings button should
be hidden.
Merge branch 'release/0.1.0' into develop
Merge branch 'develop' of github.com:nova-device/nova-ios-app into develop
Upgrade NovaSDK.

Fixes:

*   #38 Avoid cool PWM for preset settings
*   #40 Crash when Bluetooth capability not present
*   #32 Flash "test" button leaves flash on too long
Remove "Use multiple Novas" menu item. Not implemented in SDK yet.
Remove non-existent links until we have content ready
Remove deprecated TestFlight SDK #43.
Added Crashlytics
Ensure Aviary->Plist script failures will fail the build
Actually run Crashlytics build step.
Move crashlytics init to correct place.
MixPanel in-app analytics
Set video orientation when capturing image
Automatically share photo after editing when appropriate

Introduce MBProgressHUD for loading indicator when processing photo edits
Modify Crashlytics build step to no-op when no CRASHLYTICS_API_KEY
Disable Crashlytics when no API key available
Fix automatic sharing after edit; fixes #34

Introduce _didEditPhoto flag to help track state in -viewWillAppear