Reduce verbosity of logs.

We are already over limit on output size imposed by travis that is shown
in webpage, if we'll continue to add tests will be soon over limit even
to run builds.
This commit disables printing of classpath, and removes printlns in
several places.
In order for ShowClassTests to print info as is was printing
previously, please set "test.ShowClassTests.verbose" property.
Merge pull request #110 from DarkDimius/silence

Reduce verbosity of logs.