add a test page with some keys and PGP blobs

this makes testing the work-flow more easy. For now you can serve this
by running `python -m SimpleHTTPServer` in the `spec/` directory. A
serve task to grunt might be added, later.
make testing in firefox more easy

There is now a test profile that can be used for development. There is one
key (public and private) preconfigured and the test page is also added by
default. Also the test page is added as a bookmark to open it easily.