switch to using grunt connect instead of beefy

In order keep the dev environment close to what is 
deployed a connect server pointed at 'dist' is better
than a beefy server that works independent from dist.
include jar versions and simplify path to jars

in this state the sensor examples in the gh-pages of 
the dist branch will be broken.
Also the example will fail locally until you update
jar-versions to match your locally built sensor-applets
version.
[#62056960]
switch to using a timestamp directory for the jars

[#62056960]
use pack.gz jar files even without server support

[#62056960]