Fixed path quoting and added examples

I've added a couple examples that can be used to testing the script.
I've fixed the quoting to solve problem like this:

$ ./objc-run examples/script\ with\ weird\ name.m                                                                                                       ~/objc-run  master@9c2cf33 ✗
usage: dirname path
./objc-run: line 23: ${filepath}.objc-run-patched.m: ambiguous redirect
clang: error: no such file or directory: 'examples/script with weird name.m.objc-run-patched.m'
objc-run usage: clang returned with error