make iproj now produces a target that pulls together static libraries like core and platform-ios into a real dynamic framework. iosapp is pretty much just a regular iOS application that links Mapbox.framework (except for the inclusion of default_styles.hpp). iosapp runs fine in the Simulator and on a device, and the same is true for any application linking against Mapbox.framework.
The ipackage target produces both a Bitcode-disabled static framework and a Bitcode-enabled dynamic framework, eliminating the need for a separate framework.sh. It disables code signing, since that happens on copy when the framework is embedded inside the application bundle. It also merges the device and simulator builds into a single fat framework.
Also bumped itest minimum deployment target to iOS 8.0, the first version that supports linking frameworks.
Fixes#828.
`-pauseMetricsCollection` and `-resumeMetricsCollection` were originally introduced to mitigate concerns around battery usage, but `MGLMapboxEvents` has since evolved to tread much lighter on the battery. There’s no longer any need for the client to call these methods directly. The iOS test project now includes MGLMapboxEvents.h explicitly to avoid having to package a header that will go unused.
Made `+[MGLAccountManager setMapboxMetricsEnabledSettingShownInApp:]` unavailable, with a message explaining what to do instead. Removed a commented-out call to that method. Only the environment for an access token if one hasn’t already been set in Info.plist.
