Indenting for legibility
Remove debug and non-standards mode code

This is minor, but it shaves an additional 300 bytes off the build.  Note that `inherits` will only use members from the base if they do not exist in this config.  So `define` values from `base.json` are overwritten by this config.
Unused id member

This is only used by the `serve` command.
Only include real source files

There is no need to include the `src/internal` stuff here.  This simplifies the build steps to the two following commands:

```
./build.py build/src/external/externs/types.js
java -jar build/plovr-81ed862.jar build buildcfg/my-config.json > my-ol.js
```
Merge pull request #1 from tschaub/patch-1

Minor build config tweaks