Issue #301 Fix loading tmx tilesets of individual tiles #304
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Fixes issue #301
If a tile element is encountered load_tmx() will attempt to associate the tile properties with an element of tileset as normal unless a KeyError or AttributeError is encountered. If accessing a tileset causes an attribute error (because there was no previous image element that created the tileset with from_atlas()) or if it causes a key error (because there was no tile with the gid expected), then we assume this is a new tile and add it as an individual tile to the tileset.