work-in-progress on integrating dcplot into rcloud (wdcplot)
semi-colon
add dcplot.js to dependencies
wdcplot v0 - first integration of dcplot.js into rcloud

doesn't quite work yet
merge the rserve.js submodule changes in, with tagged-lang changes to rserve.js
consistently use key_value adaptor for accessors

we want all accessors to have the signature acc(key,value) so that they are
(somewhat) like dimension, group, and reduce functions

(obviously this isn't perfect because it's only really the same when the
dimension is index, i.e. all records.... continuing to refine this)
better definition of value accessor; better chart group names

all properties of dimensions, groups, and charts take a "value accessor"
which can be either a scalar value (or null), a string key name which
generates a field accessor, or an implicit lambda

not perfect because really lambdas should be inferred from the leaves up

this does weird things like assume that if its an array it's just values
when there is no reason an implicit lambda might not return an array
ignore rcloud.conf; remove bogus ignore
wdcplot works

positional arguments for group, chart
dimension name defaults to value
renamed group.dim group.dimension
fixed x transform bug
domain disables elastic
show current filter
nicer (but not perfect) filter printing
don't allow lambdas for chart.dimension
nicer error formatting
use rserve.js simple factor stuff
adapt to rserve-js with tags and factors
delete trailing whitespace
remove crummy outer_div hack; put charts into sub-div to keep
a place for errors
dc.js fixes for passing div element instead of selector
make dcplot.js errors less redundant & read better
strip internal tracking numbers from wdcplot error messages
send divs directly to dcplot & eliminate unneeded timeout
merge in dcplot support