Adding hw03
Adding test1.c
Adding lecture11
Merge branch 'master' of github.com:AllenDowney/SoftwareSystems
Adding hw04
Merge branch 'master' of github.com:AllenDowney/SoftwareSystems
Adding hash.c
Merge branch 'master' of github.com:AllenDowney/SoftwareSystems
Add random double
Add test script which reads random.txt