stream parser

[Andrei-Pozolotin]

1. current code is bound to using *.pcap file
   https://github.com/vfrazao-ns1/IEXTools/blob/master/IEXTools/IEXparser.py#L52

2. it would help instead to expose a stream parser StreamParser,
   which would operate on top of another stream/io provider,
   such as GzipFile de-compresion stream

3. proposed usage pattern, which allows to scan *.pcap.gz compressed file:

from gzip import GzipFile
from IEXTools import StreamParser
file_path = "2019-11-07.tops.pcap.gz"
with GzipFile(file_path, 'rb') as file_io:
    with StreamParser(file_io) as message_io:
         print(next(message_io))

[martinitus]

I think that would also allow to decompress while downloading