Added code to expose the persistence_diagram class, the bottleneck_distance function and the point class to python. Most of the commonly used methods for each class have been exported. The constructor for point now requires that a data argument be provided along with x and y coord. This needs to be made optional. The constructor for persistence_diagram could possibly be rewritten as well.

Write an audit for the data structure.

-DBOOST_UBLAS_TYPE_CHECK=0 is necessary since otherwise Boost's uBLAS gives a compile-time error 
when it doesn't find sqrt for polynomials. It doesn't actually need it (e.g., for LU-decomposition, 
but it looks for it during type check). (File a bug report with Boost?)