Merge pull request #5 from ap0llo/master

Fixed arithmetic operations and ToString() for non-english systems
Open solution using Xamarin studio, add xUnit console runner script for Mono/Mac development support
Prepare for release
Use Makefile instead of bash scripts
Added Petabytes
Create .travis.yml
Touch .travis.yml
Fix package restore
Update Makefile
Merge pull request #7 from JamesSinclairBiomni/master

Added support for Petabytes
v0.3.0
Update README.md