PATH 0.21 released

Sorry for releasing this new version so quickly, but 0.2 (as well as version 0.1) had some glaring problems with it that I felt compelled to fix right away. Not exactly bugs, but rather anomalies with the language itself. Since PATH is a relatively new language, I would rather do away with the anomalies quickly than create a bizarre historical quirk later.

What's been changed:
< and > are now the left and right conditionals, respectively. These originally changed the current memory cells (like in Brainf*ck), but it is much more logical to group them with ^ and v.
Similarly, { and } now move to the previous or next memory cells, respectively.