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Handle uncompressed NBT files

See original GitHub issue

Not all NBT files are gzipped. Minecraft uses two NBT’s, without compression: idcounts.dat and servers.dat. More info at Nbt#Uses.

Is there a way to currently parse a NBT without uncompressing it? I get this error trying to open servers.dat with nbt.nbt.NBTFile:

>>> os.getcwd()
'/Users/winston/Library/Application Support/minecraft'
>>> os.listdir()
['.DS_Store', 'assets', 'launcher.jar', 'launcher.pack.lzma', 'launcher_profiles.json', 'libraries', 'logs', 'options.txt', 'output-client.log', 'resourcepacks', 'saves', 'screenshots', 'servers.dat', 'stats', 'textures_0.png', 'versions']
>>> nbt.VERSION
(1, 4, 1)
>>> serversnbt = nbt.nbt.NBTFile('servers.dat', 'rb')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.4/site-packages/nbt/nbt.py", line 508, in __init__
    self.parse_file()
  File "/usr/local/lib/python3.4/site-packages/nbt/nbt.py", line 532, in parse_file
    type = TAG_Byte(buffer=self.file)
  File "/usr/local/lib/python3.4/site-packages/nbt/nbt.py", line 85, in __init__
    self._parse_buffer(buffer)
  File "/usr/local/lib/python3.4/site-packages/nbt/nbt.py", line 90, in _parse_buffer
    self.value = self.fmt.unpack(buffer.read(self.fmt.size))[0]
  File "/usr/local/Cellar/python3/3.4.2_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/gzip.py", line 365, in read
    if not self._read(readsize):
  File "/usr/local/Cellar/python3/3.4.2_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/gzip.py", line 433, in _read
    if not self._read_gzip_header():
  File "/usr/local/Cellar/python3/3.4.2_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/gzip.py", line 297, in _read_gzip_header
    raise OSError('Not a gzipped file')
OSError: Not a gzipped file