Pycddlib

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* updated for Cython 0.16
* updated for cddlib 0.94g
* updated for MPIR 2.5.1
* various fixes in documentation
* building the documentation no longer requires cdd to be installed
* documentation hosted on readthedocs.org
* development model uses gitflow
* build script uses virtualenv
* workaround for Microsoft tmpfile bug on Vista/Win7 (reported by Lorenzo
Di Gregorio)

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* added Matrix.canonicalize method
* sanitized NumberTypeable class: no more __cinit__ magic: derived
classes can decide to call __init__ or not
* improved Matrix constructor: number type is derived from the type of
the elements passed to the constructor, so in general, there is no
need any more to pass a number_type argument (although this still
remains supported)
* added get_number_type_from_value and get_number_type_from_sequences
functions to aid subclasses to determine their number type.

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* new NumberTypeable base class to allow different representations to be
delegated to construction
* everything is now contained in the cdd module
* code refactored and better organized

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* minor documentation updates
* also support the GMPRATIONAL build of cddlib with Python's fractions.Fraction
* using MPIR so it also builds on Windows
* removed trailing newlines in __str__ methods
* modules are now called cdd (uses float) and cddgmp (uses Fraction)

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* first release, based on cddlib 0.94f