update open_mp_install.rst
Merge branch 'master' of https://github.com/ucb-sejits/ctree
Merge branch 'master' of https://github.com/ucb-sejits/ctree
Merge branch 'master' of https://github.com/ucb-sejits/ctree
Merge branch 'master' of https://github.com/ucb-sejits/ctree
Merge branch 'master' of https://github.com/ucb-sejits/ctree
use the util.Timer in bilateral filter instead of some local one