Updated soa trust and user identification

	modified:   2-thesis/src/introduction.tex
	modified:   2-thesis/src/soa_p2p.tex
	modified:   2-thesis/src/soa_p2p_trust.tex
	modified:   2-thesis/src/soa_p2p_user_identification.tex
	modified:   bib/article.bib
	modified:   bib/paper.bib