Integrate 3rd party crash reporter

[pavelz]

Background

Apple provides quite a limited crash reporting.

• the customer must enable a certain obscured, scarily labelled switch
• the switch applies OS-wide - allow reporting for all apps or none
• the symbolication is complicated to get right
• the passing of reports from the device to iTunes Connect is rather unsatisfying black box - users mostly report way more crashes than seen in iTunes
• works only for apps in AppStore - there is an option of Testflight Beta but it's very unsuitable for continuous releasing

What to change

Integrate Hockeyapp SDK, which provides a crash reporting parallel to the default one, but

• is enabled per app (may need a user consent confirmation dialog)
• symbolication is stored separately and can be fixed at any time independently on iTunes
• if it crashes, it gets reported, with certain exclusions:

​http://support.hockeyapp.net/kb/client-integration-ios-mac-os-x/which-types-of-crashes-can-be-collected-on-ios-and-os-x#ios

• works for any app binary uploaded to HockeyApp

[pavelz]

​https://www.pivotaltracker.com/story/show/108232862

[mario]

Batch Modify: Added milestone Adblock-Browser-for-iOS-next for upcoming release.