Update dispersy ref
Switch endpoints
fix RSSParser
fix metadata injector
make FastI2I error messages more accurate
change metadata injector log level
add mid for candidates in debug frame

Conflicts:
	Tribler/Main/vwxGUI/DispersyDebugFrame.py
add debug prints for metadata bot
add debug command (print communities) for metadata bot
fix metadata injector
refactory a bit
Merge pull request #888 from LipuFei/fix_rssparser

fix rssparser and metadata injector
refactory some functions in Main/utility
remove unused file helpers.py
remove unused function getValidArgs()
change to use new-style classes
fix some pep8 problems
Merge pull request #896 from LipuFei/pep8_and_refactory

Pep8 and refactory
update readme
add python-requests into Windows build script