Added script for batch analysis preparation

RHY_prep_fMRI_batch.py is the batch prep script.
Usage example:

RHY_prep_fMRI_batch.py MRI_AWS_M01

It also prints out the steps to do following the prep.

Some other minor changes related to fMRI model and contrasts generation.

	modified:   .gitignore
	new file:   fmri_code/RHY_prep_fMRI_batch.py
	modified:   mcode/RHY_fmri_contrasts.m
	modified:   mcode/RHY_stim2mat.m