Small changes and fixes in bin/occi behavior

* Removed some useless and annoying messages
* Added restrictions on filter (can be used only with -m)
* 'Connection refused' messages now contain the endpoint
  that refused the connection
Updated DSL and HTTP client spec tests
Temporary fix for #28
Updated and simplified Net::HTTP hack
Merge pull request #39 from arax/client-dev

Updated DSL, bin/occi and tests