First success test of tile rendering
Added .gitignore
Just succeeded to read map file and store layers
Multi tileset tested on one layer
Added explanation to LoadTileList
Removed some redundant files
Changed sth
Implemented multilayer map reading and viewing
Added TODOs
Added some traceback symbols
Changed to better exception raising method
Used autopep8 to correct all bad code style
Merge branch 'develop'

Conflicts:
	.gitignore