Added go facebook api library

Signed-off-by: Paolo Ibarra <jpibarra1130@gmail.com>
Changed category for the Go Facebook API.
Added it in the same category is go-github.
Changed the position to maintain alphabetical order

Signed-off-by: Paolo Ibarra <jpibarra1130@gmail.com>
Merge pull request #119 from jpibarra1130/add-facebook

Added go facebook api library