chromium blah: also delete cache

the script i made to run unique isolated chromium instances, forgot to clean
up its own cache files, so it was kind of a leaky mess
chromium: update search UUID & version

i guess the new chromium (36.0.1985.125) calculates search UUIDs differently?
chromium: new way to set default search
track user tmpdir as a git repo
chromium: all instances are ephemeral now
tmpuser: ignore pulse runtime link
tmpuser: track cache dir

at least make it easier to see the upper level with "git status"

now that we "rm -rf" all chromium instances, let's make it easier to spot any traces left
launch URLs with ephemeral chromium

forgot to switch this one over\!