Merge pull request #4 from arnaudgelas/vtk6

COMP: fix linking error on Mac OS X
add one option BUILD_EXAMPLES
fix cmake warning about CMP0042 on Mac
add missing include_directories
install libraries, executables and headers
install dir for documentation
add cmake config file
fix install
Merge pull request #1 from arnaudgelas/config

Config
Merge pull request #6 from arnaudgelas/examples

Examples
Merge pull request #7 from arnaudgelas/install

Install