server.go is updated to serve npm packages instead of bower components.
The updated server:
* returns files from node_modules directory if appropriate redirect
exists in redirects.json file
* patches some import statements in .js files
For example:
import "module/file" -> import "/node_modules/module/file"
The patch is required, because browsers doesn't know anything about
node_modules
Note: The file redirect.ts is not used in this change. It is added to
describe json schema here. In an upcoming change it is used to update
source code.
Change-Id: I2435e93e0faf5984b5ebec6ca18f930da01fa9cc