String class (mostly) finished

The pymm::str class is mostly finished. I say "mostly" because some methods in the str class require the pymm::list class or pymm::tuple class to be implemented.

You can check out the subversion repository by using this command:
svn co https://pymm.svn.sourceforge.net/svnroot/pymm/trunk pymm
or by entering that URL in TortoiseSVN.

I might upload a tar.gz file so that you don't need to use subversion.

There is a tests directory in the repository which demonstrates all the str methods.
I'll work on adding compiling documentation, but it's pretty straightforward.

-Tanner