Added a note about how only one tree at a time is supported right now...
Added a note about how only one tree at a time is supported right now...

justinethier/node-kdtree,XadillaX/node-kdtree,XadillaX/node-kdtree,XadillaX/node-kdtree,XadillaX/node-kdtree,justinethier/node-kdtree,justinethier/node-kdtree,justinethier/node-kdtree