Books added:

* The Haskell Road to Logic, Math and Programming
* The Haskell School of Music
* The Haskell School of Expression: Learning Functional Programming through Multimedia
* Beginning Haskell A Project-Based Approach
* Pearls of Functional Algorithm Design
* Purely Functional Data Structures
* Haskell Financial Data Modeling and Predictive Analytics
* Haskell Data Analysis Cookbook
Removed duplicate book, rearranging books
Merge pull request #1 from dimchansky/new-books

New books