Remove sys.path.insert() from the example scripts

This line was meant to allow the example scripts to be run in the source
directory. However, this is not possible anymore with recent versions of
distutils; biggles needs to be installed first. Closes #47.
Merge pull request #50 from smaret/master

Remove sys.path.insert() from the example scripts
Merge pull request #51 from nolta/realobject

Realobject
Use print() in setup.py
Use 2to3 to build for python 3.x
import_array() returns an int with Python 3.x
Use explicit imports
Use string methods intead of functions
Fix module initialization in Python 3.x
Import print_function in the setup script

This allows setup.py to work with both Python >= 2.6 and Python 3k.
Use print() in biggles.py
More explicit exports
Use PyUnicode instead of deprecated PyString
Add Macports directory in the path