Nice ruler for altitude.

Improvements in #34
Bring Legend out to a dialog. Legend layout fixed.
Reorganize the html: move legend dialog out
Facebook share and github links added
We don't really need jQuery in about.html
Remove FB button for a while, too much js :)
About in a dialog
Minor link text modifications
UI Reorganization finished

Close #58
Grammar fix
Cleaner canopy and target icons in the Legend
Slightly reduce padding in about.html
about dialog margin setting
Dialog optimizations: jQuery and iframe on demand.
Minor: make var local
Bugfix: wrong slash
Merge pull request #61 from hr0nix/ui-reorganize

UI Reorganization branch
Merge branch 'master' into intro-tutor

Conflicts:
	index.html
	scripts/blueskies.js
Correct styles for tutor and non-tutor dialogs