initial commit of tail command
updated to read from the end of the file
Merge pull request #5 from jnashold/master

Added tail command
Merge pull request #4 from recursiveMake/master

Various fixes
added color option to obj_str()
Merge branch 'master' of github.com:ameily/pypsi
added ctrl+c support and passing shell=True to Popen()
modified usage/help messages to be inline with argparse

previous implementation was hack
added ability for commands to raise SystemExit to exit the shell
correctly exiting with return code
fixed usage text
Use os.path.sep in path completer