[FCS-25]Improved parser.
[FCS-25]Base64 content transport encoding. Fixed.
[FCS-25]'Common' module introduced.
[FCS-28] Possible module name problems resolved.
[FCS-26] Rename parser module cause of name conflict
[FCS-28] WebServer.Application moved into common. Crawler takes port as command line parameter.
Merge branches 'FCS-26' and 'master' of https://github.com/agh-glk/fcs into FCS-26

Conflicts:
	crawler/parser.py
	server/task_server.py

Add migrations, register crawler to management
[FCS-26] Register crawler to management
Merge branch 'master' of https://github.com/agh-glk/fcs into FCS-26

Conflicts:
	crawler/content_parser.py
	server/web_server.py

[FCS-26] Starting and stopping crawlers