fix bug undefined reference to clock_gettime
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
tongbu upstream
Merge branch 'master' of github.com:vipjeffreylee/BitShares
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of github.com:vipjeffreylee/BitShares
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of github.com:vipjeffreylee/BitShares
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of github.com:vipjeffreylee/BitShares
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of github.com:vipjeffreylee/BitShares
Merge remote-tracking branch 'upstream/master'
Merge pull request #3 from vipjeffreylee/master

fix bug undefined reference to clock_gettime in Ubuntu 12.04.3