Added kwarg "echo" to save_all_figs to suppress print output
fixed typo
working on fixing gen_three_port
fixed bug in gen_three_port

s33 was assigned incorrectly
now handles both "12" and "21" names properly

also added functionality for 1,2 or 3 inputs
Merge pull request #20 from sdurant/develop

Added kwarg "echo" to save_all_figs to suppress print output