Map::isFullyLoaded should be called Map::isLoaded

[brunoabinader]

This matches Style, Source and GL JS.

/cc @jfirebaugh

[jfirebaugh]

It looks like this changes the iOS public API. The backward incompatibility there is probably not worth the naming consistency.

cc @1ec5

[1ec5]

-[MGLMapView isFullyLoaded] is actually a private method that the ios-bench application redeclares for its own use in waiting for assets to load. It’s a hack, and I don’t think this change would impact iOS SDK versioning at all.

@kkaefer, can MBXBenchViewController make use of -[MGLMapViewDelegate mapViewDidFinishRenderingMap:fullyRendered:] instead, or would #1804 turn out to be a blocker?

[brunoabinader]

Closing due to ongoing terminology discussions.