v0.6.0

@MdreW on html teampltes and statics

• updated to bootstrat_italia v1.4.3
• relative path for image
• fix icon link
• fix svg, icon reindent page
• reindent page
• Added Lora fonts for error page
• fix svg link
• fix favicon link
• added validation
• fix vaildation from spid-django
• Merge branch 'italia:master' into master

Several improvements in html templates and spid validation:

• fix: spid validator tests 94, 95, 96 and 97
• fix: html template statics
• chore: metadata contact person spid extensions moved to a specialized method
• chore: metadata code cleanup
• chore: flexible attribute mapping in example project
• fix: internal attribute mapping, email
• fix: SAML2 SLO disabled