add .ipynb exclusion to gitignore
Added another 'unit' test to test_write_midi.py
Merge pull request #20 from pmargani/master

Added new 'unit' test to test_write_midi.py
Merge branch 'master' of github.com:jtauber/sebastian
note in readme about running tests
Added two different ways to construct the shortning bread song under projects
Merge pull request #21 from pmargani/master

Added two examples of shortening bread
Added a SeqBase.zip() function to unify the elements of two sequences.