1.0.0-beta1 release.

Zcash v0.11.2.z9

This version fixes a network protocol bug that prevented many users from
connecting to the z8 test network. It also solidifies the consensus protocol; we
do not expect to make any other changes to the consensus protocol, except for
possible security fixes, until after 1.0.

For an overview of the release, see the blog post:
https://z.cash/blog/new-alpha-release-solidifying-the-consensus-protocol.html

For complete changes, see doc/release-notes/release-notes-0.11.2.z9.md

Release process for z8. Issue #1140.

z7 Release

z6 Release

Change the network magic numbers.

v0.11.2.z4 release.

Update versions and release notes.

Auto merge of #873 - nathan-at-least:t832-zc2-release, r=nathan-at-least

Update release process docs; release notes; clean up ./docs directory a bit.

closes #834

Run all RPC tests, even when they fail.