Adding JSON files to the .gitignore
Add package.json to make it nw-able

I'll need to add the actual files shortly.
Adding nwjsondb.js and the nw HTML file to the project tree.

Everything should work now.
Add nwjsondb-test.json file for testing.

Everything is confirmed to be working now:

Load NW app, fire up debug console, type the following:

```
var d = new nwjsondb_Database("nwjsondb-test.json");

d.parse_file();
```

Then

d.db.database

evaluates to "nwjsondb" as it should.

Signed-off-by: Kristofer Rye <kristofer.rye@gmail.com>