first draft of LT description
Added logic tree structure description
updated logic tree section
Updated description of GMPEs
improved output description
added .ps plots and updated gitignore accordingly
Revised and updated chap 1
Merge branch 'haz-marco' of github.com:GEMScienceTools/oq-engine-docs into haz-marco
Revised and improved Chap 2
Merge branch 'haz-marco' of github.com:GEMScienceTools/oq-engine-docs into haz-marco
revised and updated chapter 3
Changes to chap 4, glossary and gmpes description
Added in the appendix the list of MSRs
completed chapter about demos
merged remote branch and solved merge conflict
completed section about GMPEs
small correction about absolute uncertainties
added figures for demos folder
some changes to the gmpes appendix
Merge branch 'haz-marco'

Conflicts:
	misc/configuration.tex
	misc/glossary.tex
	misc/hazard.bib
	misc/hazard.bib.bak
	oq-manual.tex
	oqum/hazard/.00_intro_oq.tex.swp
	oqum/hazard/.00b_mfds.tex.swp
	oqum/hazard/.01_using_oq.tex.swp
	oqum/hazard/00_intro_oq.tex
	oqum/hazard/00b_mfds.tex
	oqum/hazard/01_using_oq.tex
	oqum/hazard/appendix/gmpes.tex
	oqum/hazard/appendix/msr.tex