Use floating point division.
Merge pull request #59 from enthought/fix-integer-division

Use floating point division wherever appropriate in examples.
updated for QL1.4 build
removed distutils pragma in source code
allows CahsFlow.amount() to raise exceptions
simplified _thisptr structure
somes fixes to swap methods and exposes debug builds in setup.py
removed ql/quantlib.hpp usage and adds a patched version of
ql/settings.hpp to be used locally when in dll context
symbols needed to create the QuantLib.dll
add DEBUG flag to control debugging on Windows
added fixme and removed useless include
updated namespace import
moved quantlib.settings pyx file in the quantlib dir (removed
quantlib/settings/)
ignore the QL dll if present
adding notes about the windows build
add conditional include for the platform
fix setup.py: QL_LIBRARY was defined only for windows
stupid fix to an ifdef and added boost include path
add info about copying the dll on the path
helper script for def file generation based on .obj