Update README.md

Removed banner of development site.
Moved screenshots to this repository.
Fixed image links.
Version 2.0 Beta 2
Added changelog.
Fixed recursion bug in Spider. Thanks Hu Jekkay!
Added analytics
Fix for ticket #2
Update web_utils.py
Merge pull request #3 from moon2l/patch-1

Update web_utils.py
Version 2.0 Beta 3
Fixed bug in SpiderFoot plugin found by dominiohacker.com
Fixed bug when using the cjson module instead of the built-in json module.
Beta 5, RootedCON Edition
Patching up last minute bugs... blame the demo effect :)