write JStack requests to the log file

limit log file strings to 2K displayed in the browser
Merge branch 'erdos-8' of github.com:0xdata/h2o
Merge branch 'master' of github.com:0xdata/h2o
Merge branch 'master' of github.com:0xdata/h2o
Merge branch 'master' of github.com:0xdata/h2o
adding our new math geek, irene