import git://github.com/brendangregg/FlameGraph @ 250bd356837aa62188b3205918b6b05c04d54c93
import https://code.google.com/p/jrfonseca.gprof2dot/ @ 3c962f82e5640941dfb9cbc1abe8dfd3ae2d14da
add stackprof-flamegraph and stackprof-gprof2dot wrappers
v0.2.3