[FCS-30] Two policies for handling crawling depth.
[FCS-30] Crawler CLOSING state.
[FCS-34] BerkeleyContentDB class connected into task server.
[FCS-34] Downloading crawling results via web app.
[FCS-34] Downloading improved.
[FCS-34] Downloading package with specified size.
[FCS-34] Downloaded files names changed.
[FCS-34] Views  tests updated.
Merge branch 'FCS-34'

Conflicts:
	server/task_server.py
[NT] Vagrant and requirements.
Merge branch 'FCS-30'

Conflicts:
	server/task_server.py
	server/url_processor.py
[NT] [Merge] Depth policy.
[NT] Quickstart.
Merge remote-tracking branch 'origin/master' into FCS-35

Conflicts:
	server/task_server.py