Fix build.

// FREEBIE
properly update transport options location

// FREEBIE
fix bithub payment link and image
use PartAuthority when fetching part streams
resolves the self-send case

Fixes #2259
// FREEBIE
Merge pull request #2264 from mcginty/write-part-data-fix

use PartAuthority when fetching part streams
merged  WhisperSystems/master