got rid of dependency on posix module; replaced posix_getpid with getmypid
https://github.com/facebook/phpsh/pull/19
inputrc fix
https://github.com/facebook/phpsh/pull/29
Accept 0 as a non error exit status for PHP interpreter
https://github.com/facebook/phpsh/pull/45
read till the end of the comm_file and check that line for ready instead of what happens to be the next line to be read.
https://github.com/facebook/phpsh/pull/46