Merge pull request #972 from greenbender/dev

Added ARTICLE command to NNTP Proxy

You need to upgrade pynntp by running:
```
sudo pip2 install --upgrade pynntp
```
More optimisation in binaries.php
Delete parts from partrepair when group reset/purged
Fixed ARTICLE command

The command was auto-detecting yEnc and decoding it which is not
desirable behaviour for a proxy

Due to changes in future versions of pynntp added a check for the
number of returned values for the article command which will change
for pynntp>0.8.3