The importers package adds functions to traverse the AST of a Go
file or set of packages and extract references to Java packages and
types.
The java package adds a parser that uses the javap command to extract
type information about Java classes and interfaces.
The resulting type information is needed to generate Java API wrappers
in Go.
This is the first part of the implementation of proposal golang/go#16876.
For golang/go#16876
Change-Id: Ic844472a1101354d61401d9e8c120acdee2519df
Reviewed-on: https://go-review.googlesource.com/28595
Reviewed-by: David Crawshaw <crawshaw@golang.org>
