Unable to evaluate code when no file is open

[brweber2]

It would be nice to be able to use the "buffer" that is available when Clooj is first opened to write and evaluate code as a scratchpad. Currently, it throws an Exception because somewhere in the code it assumes that a file exists.

If you'd like the specific stacktrace, let me know and I can attach it to this issue. I believe that it is somewhat downstream from the actual error however so I'm not attaching it right now (and it should be really easy to re-produce...).

[DanBurton]

+1 would be nice to have the Dr. Racket-esque behavior of being able to load the current buffer into the REPL whether or not the user has saved it to a file. Would also be nice to have syntax highlighting in the Source Editor area even if a file is not currently open.