Add new subproject, "Rose"
Initial commit for new project
Removed redundant unpack operation in tree.js
Added "makeSheetRenderable" method in rose.js
Made it so trees no longer spawn

Renderable's setVertices, setElement, etc. methods now take an "explode" paramter which tells the method
whether or not to expand the array
Renderables now start with an initialized and identitied mvMatrix