Remove fork of KSCrash from dependencies

[kattrali]

Changes

This is a rework of the workspace and dependencies to use standard KSCrash 1.0.2 and above.

This will be a major release.

Source

• Combine BugsnagNotifier implementations into a single class

Installation / Dependency Management

• Update installation instructions for manual configuration
• Convert podspec to JSON
• Moved KSCrash dependency into Carthage/Checkouts for possible future Carthage support
• Update minimum deployment targets to iOS 7.0 and OS X 10.8, per changes in KSCrash
• Add instructions for crash symbolication with bitcode

Organization

• Use dependency submodule directly in the workspace
• Split top-level workspace into separate workspaces for iOS and OS X, to handle this Xcode "feature"
• Reorganized files to reduce nesting and share between workspaces:
  • Source: The library code
  • Tests: Bugsnag tests
  • iOS: iOS-specific build files
  • OSX: OS X-specific build files

New features

• Swift demangling
• Bitcode support
• Improved crash reporting for malloc errors and overwriting link registers

Resolved Issues

Fixes #94
Fixes #80
Fixes #78
Fixes #72
Fixes #67
Fixes #62
Fixes #52
Fixes #44
Fixes #41