Draft no classpath.txt

ovation.util.ovation_classloader creates a new URLClassLoader with the
Ovation JAR at the top of the classpath list. It uses existing
classloader as the parent. In other words, we accomplish what we were
doing with classpath.txt, but in an isolated class loader.

Everything works, including DSC creation (by ovation.log), but the
connectMethod.invoke call doesn't return the DSC to matlab.
Invoke works, but not for connect
Merge branch 'master' into isolated-classloader
Adds tabular measurement test
Working download to support directory

Everything seems to work, except for one minor detail… ;-)
DSC authenticates, but connectMethod.invoke() doesn’t return anything.
Argh!
Write etag
Adds first run classpath modification

1. Taking from Ovation 1.x, we modify toolbox/local/classpath.txt as
need on first run.
2. API JAR is auto-downloaded based on etag.
Restart only once...
Move error up so we don't modify the classpath until online.
Merge pull request #2 from physion/isolated-classloader

Automated classpath installation and JAR download