Update searchnzb.py

marking line 104 for change as nzb is returning size as None periodically. the multiplier then barfs on line 105 when this happens
Resolve ISSUE 35
updated to set nzbsize to 1000 if it is missing from NZB response from provider.

Not sure why that can happen, but it can ISSUE 35
Update SimpleCache.py

Too solve: 
/opt/LazyLibrarian/lazylibrarian/SimpleCache.py:8: DeprecationWarning: the md5 module is deprecated; use hashlib instead
import md5

Seems to work without any side effects.
Minor change to place the Loglevel setting in the General CONFIG value.

Have to get it into the UI next. But for now after update the value will be available
in the config file for changing.
0-warning
1-info
2-debug
Errors are always reported
Merge branch 'master' of https://github.com/DobyTang/LazyLibrarian
Input max length fix for issue #38
Merge pull request #39 from niprog/master

Input max length fix for issue #38