Convert gen_app_yaml.py to optparse
This allows for example the -f flag to be specified as the second
argument. Also add a '-i|--interactive' flag which asks for the
application name interactively.
#!/bin/sh
NOSE_WITH_DOCTEST=t
export NOSE_WITH_DOCTEST
NOSE_DOCTEST_EXTENSION=txt
export NOSE_DOCTEST_EXTENSION
#NOSE_DETAILED_ERRORS=t
#export NOSE_DETAILED_ERRORS
nosetests $*