Switch to radio buttons for pledge

Some bugs yet, and needs cosmetics
Defaults work.
Tweaks to radio pledge, logging
more clear wording on pledge page about share matching
Switch to radio buttons for pledge

Some bugs yet, and needs cosmetics
Defaults work.
Tweaks to radio pledge, logging
rebasing (attempting for first time) the radio stuff up to newer master
Merge branch 'radio' of github.com:dlthomas/snowdrift into radio

Conflicts:
	Model/Shares.hs
fixed merge errors I missed before
Squishy JS for share radio buttons.