Updated readme.
Remove CMAKE_BUILD_TYPE hack, it's probably really bad to have if importing into another project.
Vector: Made to_string() a member function. Might as well make it standard to have hash() and to_string() in every class that needs them.
Vector: Removed free to_string() function after previous change. Lets not keep around unnecessary clutter.
Alignment: Added to_string() function.
Circle & Rectangle: Added to_string() functions.
Circle & Rectangle: Made requireNonNegative helper function static.
Circle & Rectangle: Fix to_string() implementations and add tests.
Circle & Rectangle: Added copy cast constructor.
Merge branch 'develop'