Remove unnecessary validation, remove bind-host stuff, small comment fixes
Set mirrors config variable to all 4 mirrors by default.
Fix a few class docs
Make max duplicate progress reports configurable. Fix #57.

To fix #57 we just needed a higher value, like 30.
Fix small mistake in Worker initialization
Fix docs: Add hash symbols for comment block
Merge pull request #64 from dbpedia/download-smallfixes

Some small fixes