Changes in crawler and indexer
* Added progress meter and more exception handling to crawler
* Imported exif-py (https://github.com/ianare/exif-py) as exif
* Added EXIF parser
Lots of changes from the last couple of days
* Added server + protocol fields
* Added filename based parser
* Added enzyme based parser
* Moved hachoir metadata enricher to separate postprocessor
* Changed the way video's are scanned; First, try it with Enzyme
  then, try again with hachoir. This results in a significant
  speedup without the loss of any fields
* Changed indexer protocol field to be more inline with protoindexer
* Created wrapper class around all metadata parsers to simplify
  bin/indexer.py
* Various tweaks to the EXIF parser
* Removed logger support from hachoir metadata parser