added build directory to .gitignore
Merge pull request #1 from thearn/master

added build directory to .gitignore
adding toms stuff
Merge branch 'master' of https://github.com/JustinSGray/pyCycle
copy=None in duct
fix to secant solver
Merge pull request #1 from JustinSGray/master

Pull Justin's latest back to my branch