RC1 of V0.7

Much new capability added from 0.6 to 0.7. Including:

• Asset capability for Material
• Axis-angle parsing for rotation
• Aadditional color type f3 (fractional rgb - direct support for X3D)
• Handled external XSeen files in XML format.
• Device camera background use.
• Device motion controlling object position
• Multiple scene cameras
• Spherical (photosphere) backgrounds
• Improved event handling
• Indexed triangle sets.
• Position attribute mutations for all 'solid' tags. (RC1)
• Cleaned up some extra console output statements

Some of the new features are shown in home-page example