JENKINS-16351 -  Modification to build status balls to be less distracting 

The existing build status balls flash / blink, which can be distracting.  These new balls have a more subtle glow.

Fixes slight horizontal misalignment of status balls.

Removes dependency on "inkscape' to convert svg to png in make.sh.

https://issues.jenkins-ci.org/browse/JENKINS-16351