Extracting classes related to PLY models to its own library

Those classes are currently part of the eqPly example, but
they are actually used by other examples and tools. Besides
some other project want to benefit from them.
Merge pull request #273 from tribal-tec/master

Win32 build fixes
CR #272 and assorted cleanups
Merge branch 'master' of https://github.com/Eyescale/Equalizer
Fix: https://github.com/Eyescale/Equalizer/issues/275

Do not execute dump Image tests if not GPUs available.
Merge pull request #276 from julitopower/master

Fix: https://github.com/Eyescale/Equalizer/issues/275
Cosmetics
Merge branch 'master' of https://github.com/Eyescale/Equalizer
-Use boost program_options instead of tclap for command line parsing
-Removed tclap dependency entirely, now building on windows again
Merge branch 'removeTCLAP' of https://github.com/VMML/Equalizer
CR #278
Fix Win32 build