version 0.3.01

Changes:
- automatic build testing for Linux and MacOS X
- automatic tests for some tools
- a unit testing framework for functions
- python wrapper: bart.py
- fix problem with matlab wrapper
- change default path for fftw on Mac OS X
- new tools: carg, wavg
- carg: complex argumemt
- wavg: weighted average
- library: tools for chebyshev approximation
- library: improvements for type safety
- many other bug fixes and enhancements