Merge pull request #20 from briancappello/master

fix small import issue in the README
switch to (hopefully) cross-platform nan checks.
note about windows.
improve installation on Windows.
Can't use separate lib files if we want to have the .c files checked in.
Manually include the "right" headers on windows.
version bump to 0.4.4.
adding a note about windows.
ignore all .so.
change version to 0.4.5-git.
specify nose python version in makefile.
support for Python 3.3.
minor fix.
abstract should be cython 0.18.
allow version to be parameterized in makefile.
adding install target.
update pypi categories.
fix updated common.so name in Makefile
cleanup setup.py platform specific code to be more flexible while maintaining the whitelist approach
update the README with manual install from git and further help on installing the TA-Lib