Revise manyboxplots ractive to not rely on coffeescript
Fix bug in scatterplot ractive and convert to javascript

 - No longer rely on coffeescript

 - Having 5 padding parameters posed a problem
    - pull out the pad.scale as a separate parameter, scalePadding
    - revise plotframe.coffee/plotframe.js to handle this
manyboxplots template: add missing semi-colons
New ractive: correlation matrix with linked scatterplot
Remove corr_w_scatter.js; never should have added it
corr_w_scatter: better choice of no. digits in axis scales
Merge pull request #32 from kbroman/master

Convert scatterplot and manyboxplots examples to javascript