made strategies continue file requesting if not all have been queued
reduces the default number of files to request as there's now a continuer
fixed duplicate releasing of files after download
fixed missing call to report progress
Merge remote-tracking branch 'origin/continuos_file_requesting' into continuos_file_requesting

Conflicts:
	pydb/com/strategies/__init__.py
Merge pull request #40 from montaggroup/continuos_file_requesting

Continuous file requesting