Calico Scheme: Add classes, dot-methods, and maybe threading macro

[Doug Blank]

Some good ideas from hy:

http://nbviewer.ipython.org/github/bollwyvl/hy_kernel/blob/master/notebooks/Tutorial.ipynb

[Doug Blank]

Creating a class programmatically (after http://stackoverflow.com/questions/15247075/how-can-i-dynamically-create-derived-classes-from-a-base-class):

def set_x(self, value):
    self.x = value

SubClass = type('SubClass', (BaseClass,), {'set_x': set_x})  # Methods can be set, including __init__()

obj = SubClass()
obj.set_x(42)
print obj.x  # Prints 42
print isinstance(obj, BaseClass)  # True