Front-load background SVG request

Perform SVG background image data request on page load, so that the SVG
download image rendering is entirely client-based. Previously, the SVG
background request was performed upon Download processing.

Signed-off-by: Joseph Lee <josephl@cecs.pdx.edu>
Statically hide cluster table

Cluster table flickered on load due to JS hiding waiting for DOM ready.

Signed-off-by: Joseph Lee <josephl@cecs.pdx.edu>
Merge branch 'fix_table'
Merge branch 'master' into gh-pages