Fix Issue #22, 23 -> Finished basic functionality for builder.
Fix Issue # 20 -> Allow user to add their own activation functions.
Add contains() in activationfn/errfn
Add getFnNames() in activationfn/errfn, fix some typos in
activationfn_test and errfn_test
Copied tests over to fix nosetests detection problems.
Reimplementing Builder, finished skeleton according to spec
Add tests for Builder, add skeleton for remove function, fix some docstrings
Fix some syntax error in test/builder_test.py
Finished constructor, getter and setter. Fix some bug in test.
Finished append and fixed some bug in helper functions.
Finished insert.
Finished remove, clear, and setter for default af and errfn.
Finsihed all essential functionality of Builder. All tests passed.
Removed the outdated builder.py
Add underscore to front of all helper methods.
Add some more tests for build
Fix docstring and add more tests
Add check to make sure input/output layer units are specified.
Fix typo and indent in docstring
Merge pull request #38 from ImpGuard/builder

lgtm