Exception raises when mbtiles file is not in the main bundle

[andreacremaschi]

RMMBTilesSource: there is an issue when .mbtiles file is not in the app's main bundle: FMDatabaseQueue will throw an exception: "Could not create database queue for path map.mbtiles".

I fixed this just modifying RMMBTilesSource.m:

queue = [[FMDatabaseQueue databaseQueueWithPath:[tileSetURL relativePath]] retain];

with:

queue = [[FMDatabaseQueue databaseQueueWithPath:[tileSetURL path]] retain];

[incanus]

Closed in favor of #43.