This change adds all information that is needed to generate the externs
file to build/info.json, so tasks/generate-externs.js no longer needs
to spawn JSDoc.
If a `src` config is not provided, by default, all of the library sources are included. There is some special handling in the build task to make sure all library sources are included regardless of the path to the build config. When someone includes a `src` config, path patterns are assumed to be relative to the current working directory (unless overriden with the `cwd` config). So, when you use the `src` config, your config is no longer portable.
The test.js task starts the development server and runs the tests in PhantomJS. As mentioned in the readme, when running the tests continuously during development, it is more convenient to start the dev server and visit the root of the test directory in your browser.
Later we can bring in Karma to drive PhantomJS and other browsers, but this simple "run once" task is useful for the CI job.
By default, all paths in the build config (e.g. externs) are assumed to be relative to the ol3 repo root. To make it so relative paths are resolved from a different directory, use the cwd option.
In addition, this change makes it so the `build.js` task can be run from another directory.
Whitespace builds are still painful to debug. Skipping the compiler altogether and simply concatenating sources is a better option for development and debugging. By ommitting the `compile` option in a build config, the output is "uncompiled" - a straight concatenation of all sources in dependency order.
This task generates build related metadata for the library based on doc annotations. Since it is about more than writing out exportable symbols, it makes sense to have a more general name.
