[make] clean all droppings
[blog] tweak oscon trip report
[install] update install and install-www pages
[mirage-www] modern opam switches
[wiki] update dates on install/mirage-www
Merge branch 'master' of https://github.com/mirage/mirage-www

Conflicts:
	tmpl/blog/oscon13-trip-report.md
[blog] more edits to oscon, including proper quotes
Merge pull request #24 from mor1/master

blog and wiki updates