Import GraphML files correctly (Issue #147)

Fix for issue #903: 0.8.2 with JDK8

Fix for issue #903: Updated Netbeans release to 7.4 and upgraded some MVN-Plugin versions to avoid MNG-5482.

- Default edge type needs to be 'MIXED', as default edge type is a misnomer

corrected HITS calculation (issue gephi/gephi#620)

- initialized authority and hubs to 1 at each iteration
- used outgoing edges instead of incoming edges for hubs computation
- renamed 'target' to source for incoming edges in authority computation

Review of the logic would be appreciated.

Normalization is different from the one in the original paper, but this might not be affecting the logic. networkx uses same normalization logic as the one used here.

Bump AttributesImpl module version for updates.

Use gephi version name in windows default install folder to avoid overwriting old installed version.