added the start of live documentation

Hopefully this will become useless soon, but for now it may be a good
stopgap.
get branch working again
strip out URL from GET querystrings
a bit of formatting even though this will be extracted out
move markup to a plugin instead of client code
add htmlentities gem, unescape querystring in livedoc plugin before parsing
fix form markup
rig things up to use ajax
cleanup markup
add parameters and parameter liquid tags and example
added the start of live documentation

Hopefully this will become useless soon, but for now it may be a good
stopgap.
get branch working again
strip out URL from GET querystrings
a bit of formatting even though this will be extracted out
move markup to a plugin instead of client code
add htmlentities gem, unescape querystring in livedoc plugin before parsing
fix form markup
rig things up to use ajax
cleanup markup
add parameters and parameter liquid tags and example