Corrected kill_parsers()

kill_parsers gave syntax errors, and has been corrected to kill all parser processes and to clear the parser_pool list. Tested with Python 2.7
Fixed initial line shell reference

The initial line had an extraneous "SDF" (unknown reason?). Without this, the line should be interpreted as a comment by Python, and a Python shell command by the shell.
Merge pull request #1 from winwaed/patch-1

Fixes typo in shebang. Corrects apparent syntax error in kill_parsers().