Implement the features of lispy2

[adamhaney]

I didn't realize that Norvig had included a new version of lispy (lispy2) that includes many of the features I was interested in implementing.

http://norvig.com/lispy2.html

Integrating this portion of the code base into lispy could eliminate the process of implementing reader macros (#10 ) which could allow us to move on to other more exciting language features. Only a portion of this code base should be used for reference and the changes from this version should be contained within the norvig dialect.

[adamhaney]

The complete version of this file is available at http://norvig.com/lispy.py