Parallelize make call to build examples in test release tarball script.
Parallelize make call to build examples in test release tarball script.

The testRelease script does, essentially: `cd examples/ && make`. This is
amenable to parallelization; each rule in the makefiles take one chapel file
and compiles it.

This uses the same pattern for parallelization as llvm and gmp builds.

git-svn-id: 88467cb1fb04b8a755be7e1ee1026be4190196ef@23823 3a8e244f-b0f2-452b-bcba-4c88e055c3ca

sungeunchoi/chapel,chizarlicious/chapel,hildeth/chapel,hildeth/chapel,hildeth/chapel,chizarlicious/chapel,chizarlicious/chapel,hildeth/chapel,chizarlicious/chapel,hildeth/chapel,sungeunchoi/chapel,CoryMcCartan/chapel,sungeunchoi/chapel,CoryMcCartan/chapel,chizarlicious/chapel,sungeunchoi/chapel,hildeth/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,chizarlicious/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,chizarlicious/chapel,sungeunchoi/chapel,sungeunchoi/chapel,sungeunchoi/chapel,CoryMcCartan/chapel,sungeunchoi/chapel,hildeth/chapel