Merge pull request #23 from davidw/master

Give kill and stop functions the ability to kill/stop erlang Ports.
Update exec.erl

Function comments clarified
Update .travis.yml
Added a start/0 so that exec can conveniently be started with the -s command.
Merge pull request #25 from jkingsbery/master

Added a start/0
add support for pty
add support for pty
add pty echo support
modify build system
Fixed compilation issue on Linux Mint
Cleanup
(memcheck) Fix a Mismatched free() / delete / delete []
Don't call close() on negative file descriptors
Merge branch 'memcheck' of git://github.com/oliv3/erlexec into oliv3-memcheck
Fixed a failing test case of delayed signal
Merged changes
update pty
remove unused header
correct build problem on x86_64 darwin system
Merge pull request #27 from zenkj/pty

Added pty support