Added sparsehash-2.0.2 code into this project, since compilation of HAPI-UR requires
source changers to the sparsehash library.
Applied modification to sparsehash densehashtable.h
Added .gitignore to ignore .deps
added *.o and *.a object and library files to .gitignore
Removed sparsehash source tree
added sparsehash include tree with modified densehashtable.h
modified Makefile to include bundled sparsehash in CFLAGS
added built binaries to .gitignore
added vote-phase binary to clean target
added simplistic top-level makefile to build or clean all targets
added simple compile instructions to README