Initial add of gtest.
Initial add of libtiff.
Do not use vtk's own libtiff since it fails on Darwin.
Initial add of glog
Initial add of gflags
Initial add of gperftools
Initial add of protobuf
Initial add of sparsehash
Initial add of UHD driver/sdk
Merge pull request #410 from jcftang/wip-uhd

Initial add of UHD driver/sdk
Merge pull request #409 from jcftang/wip-sparsehash

Initial add of sparsehash
Merge pull request #408 from jcftang/wip-gflags

Initial add of gflags
Merge pull request #407 from jcftang/wip-glog

Initial add of glog
Merge pull request #406 from jcftang/wip-protobuf

Initial add of protobuf
Merge pull request #405 from jcftang/wip-gperftools

Initial add of gperftools
Merge pull request #399 from hashdist/johannr/gtest

Initial add of gtest
Initial add of libatomic_ops
Initial add of Boehm gc
Initial add of gzip
Initial add of patch