added gitignore

Modified aeids.py, not sure what

add database structure and modify readme

modify readme

Fix the bug of calculating threshold using skewed median

Fix bug that cause memory leak when running experiments multiple times

Removed TODO list

Put condition lock to replace time.sleep in all functions in aeids.py

Modified waiting process to use condition lock instead of time.sleep

Fixed the multithreading implementation, to make it faster.

Final version of TCPStream implementation, still running slow, but the streams are correct.

Added id, starting and stopping time of TCPMessage

Added script to convert pcap files to csv files

Changed the connection list in pcapreader to collections.deque

Uses pynids to do TCP reassembly