Fix __delitem__ in TAG_list.
Merge pull request #64 from Fenixin/small-fix

Fix __delitem__ in TAG_list.
Fix behavior of __delitem__ on TAG_Compound

list = list[:i] + list[i:] just doesn't work like the author expected...
Fix infinite loop while writing a chunk changing the way in which free space is searched in the region file.
Add exception when opening files too small to be a region file.
Merge pull request #66 from Fenixin/fix-update

Fix infinite loop when writing a chunk. Add new exception.
Properly close files
If a fileobject is specified, it is the callers responsibility to close the fileobj.
Bug fix: parse_file() properly raise exception.
Previously, the exception was created, but not raised nor returned.
Add test function to check for closed file.
Bug fix: WorldFolder.iter_chunks() returns Chunk subclass
Update changelog for 1.4
Add historic changelog info for 0.6-0.9