Added a string stack, and reformatted a few things.
Added a string stack, and reformatted a few things.

saulshanabrook/Clojush,saulshanabrook/Clojush,NicMcPhee/Clojush,NicMcPhee/Clojush,thelmuth/Clojush,thelmuth/Clojush,lspector/Clojush,Vaguery/Clojush,lspector/Clojush,Vaguery/Clojush