Change PostProcessing checks and rules

+ Change replace rules
+ Include PR-708-mrmachine Don't process files in the TV download directory if they have been modified in the last 60 seconds.
+ Include PR-620-jayme-github Process files by size (smallest first)
+ Add postProcessor checks: status, quality/filesize, already processed
+ Change search for airdate in database instead of thetvdb
+ Add tv download dir as default manual post-process directory
+ Add is_proper to nameparser
+ Change use quality from snatch history instead of status quality
+ PEP8