add PDF files from SOWFA tutorial and webinar

These instructions may be slighly out of date for the GitHub
version of SOWFA, but still plenty of essential information
on the theory and code capabilities
modify to run/clean the updated pisoFoamTurbine solver
add required input files for the fastDuct tutorial

There were several instances of missing input parameters and
typos (case sensitive) within the input files.  At this point
the fastDuct tutorial still gives errors during compiling...I
think there are more missing input parameters but I'm not sure
where to add them yet...
ignore (do not track) output files from fastDuct tutorial
modify so only OpenFOAM v2.1 compatible applications are compiled/cleaned