Corrected the documentation related to the IsosurfaceVolumeData by downcassing ISO to Iso
Renamed ISOSurfaceVolumeData file to IsoSurfaceVolumeData
Corrected IsoSurface references after file rename
Corrections on the documentation of the Volume Rendering component
Merge pull request #407 from aarbelaiz/volume-doc-update

Volume rendering component doc update
fix for #392 Click event on navigation operations (rotate, drag, zoom)
Custom shader tutorial / example extended by a slider and custom shader attributes
Merge branch 'master' of https://github.com/x3dom/x3dom
fix for #392 Part II