Fix sim inputs file keyword name in make_sim_inputs.py.

The sim inputs file keyword in the make_sim_inputs() function did not match the argument defnition in __init__.py, which prevented the user from specifying a custom sim inputs filename when using the form "pyger make".

Signed-off-by: Matthew Dahmer <matthew.dahmer@gmail.com>
Update version from 0.5 to 0.5.1

Signed-off-by: Matthew Dahmer <matthew.dahmer@gmail.com>
Merge pull request #6 from sot/fix_init

Fix sim input filename keyword in make_sim_inputs.py