The homebrew formula uses vtk6 now
Merge pull request #713 from fran6co/patch-3

[DOC] The homebrew formula uses vtk6 now
build: Fix missing definition of uint64_t

On gcc 4.8.2 (fedora 20) without c++11 enabled the definition of
uint64_t is missing.  Switch to the pcl typdef for boost::uint64.
Merge pull request #715 from gcasey/uint64-fixes

build: Fix missing definition of uint64_t