Do not generate session id when there is already one

[fixes #101]
No more _temp assets
Switch to Typotheque web fonts
Tidy up font varibles
wire up tooltip widget
refactor flash wrapper & basic content & design for tooltip
tweak tooltip design
Fix flash of white before app loads
Merge branch 'master' into cordova

Conflicts:
	app/widgets/flash-modal/content.ract