FIX: Remove node.js versions: 0.4 and 0.7 from travis conf

these version are not installed anymore on travis
FIX: Update development dependencies to the latest versions.
NEW: Add node.js version 0.10 to travis conf.
NEW: Add as dev dependencies csv-stream module to showcase the client#createAddStream method.
NEW Showcase the client#createAddStream method.
FIX: Update module dependencies to the latest versions

These dependencies are used exclusively by the client#createAddStream method.
NEW: Add npm stats logo.
NEW: Support multiple group fields

Close #62x
FIX: Change the field cat by description, a field available by default in a Solr database.

The default configuration does not provide the field cat so the test fails against a real Solr database with the default configuration.
FIX: Indent correcly and remove trailing spaces.
FIX: Update the request module to the latest version published 2.27.0
FIX: Remove console.log.
RELEASE: v0.2.7
Syncing with master