introduce iOS testing - Githubissues

This adds automated testing + Travis to the Cocoa bindings & static library.

Moves the iOS test app from gl-native to this project.
Makes use of KIF for gesture-capable integration testing.
Creates a new basic app in /test strictly for tests (and avoids needing GYP for it).
By way of KIF requirements, adds iOS accessibility support to accessory views.
Adds Travis CI automation.
Adds some initial compass & panning gesture tests.

cutting-room-floor / mapbox-gl-cocoa