index.html: enable loading of libs in dev mode
project.clj: added piggieback dependency
.gitignore: added repl and .repl directories
app.js: old content is the result of running Leiningen (contained google closure advanced compilation result), only committed so that TodoMVC in Om can be executed. The current content is what should be in the file - not entirely sure where it came from and doubting whether it's a good idea to overwrite the file with its compilation