如何使用Golang lib / pq API将二进制数据插入PostgreSQL BYTEA列？

I'd like to insert some binary data into a BYTEA column

How would I go about inserting the contents of somefile.tar.gz into a table with a BYTEA column?

1. An example will help
2. Is it possible to use HEX format of BYTEA (postgres 9.2)?
3. Is it possible to stream to/from postgres from/to golang?