Add new CHANGELOG and RELEASE docs.

CHANGELOG.md

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+# CHANGELOG
+
+## v2.0.0.pre (5/13/2016)
+
+This is the initial pre-release of the sirp gem.
+
+It is for review only and should not yet be used in production.

RELEASE.md

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+# Gem Release Process
+
+Don't use the `bundle exec rake release` task. It is more convenient,
+but it skips the process of signing the version release task.
+
+## Run Tests
+
+```sh
+$ bundle exec rake test
+```
+
+## Git Push
+
+```sh
+$ git push
+```
+
+Check for regressions in automated tests covered by the README badges.
+
+## Bump Version Number and edit CHANGELOG.md
+
+```sh
+$ vi lib/sirp/version.rb
+$ git add lib/sirp/version.rb
+$ vi CHANGELOG.md
+$ git add CHANGELOG.md
+```
+
+## Local Build and Install w/ Signed Gem
+
+The `build` step should ask for PEM passphrase to sign gem. If it does
+not ask it means that the signing cert is not present.
+
+Build:
+
+```sh
+$ rake build
+Enter PEM pass phrase:
+sirp x.x.x built to pkg/sirp-x.x.x.gem
+```
+
+Install locally w/ Cert:
+
+```sh
+$ gem uninstall sirp
+$ rbenv rehash
+$ gem install pkg/tss-x.x.x.gem -P MediumSecurity
+Successfully installed sirp-x.x.x
+1 gem installed
+```
+
+## Git Commit Version and CHANGELOG Changes, Tag and push to Github
+
+```sh
+$ git add lib/tss/version.rb
+$ git add CHANGELOG.md
+$ git commit -m 'Bump version v2.0.0'
+$ git tag -s v2.0.0 -m "v2.0.0" SHA1_OF_COMMIT
+```
+
+Verify last commit and last tag are GPG signed:
+
+```
+$ git tag -v v2.0.0
+...
+gpg: Good signature from "Glenn Rempe (Code Signing Key) <[email protected]>" [ultimate]
+...
+```
+
+```
+$ git log --show-signature
+...
+gpg: Good signature from "Glenn Rempe (Code Signing Key) <[email protected]>" [ultimate]
+...
+```
+
+Push code and tags to GitHub:
+
+```
+$ git push
+$ git push --tags
+```
+
+## Push gem to Rubygems.org
+
+```sh
+$ gem push pkg/sirp-2.0.0.gem
+```
+
+Verify Gem Push at [https://rubygems.org/gems/sirp](https://rubygems.org/gems/sirp)
+
+## Create a GitHub Release
+
+Specify the tag we just pushed to attach release to. Copy notes from CHANGELOG.md
+
+[https://github.com/grempe/sirp/releases](https://github.com/grempe/sirp/releases)
+
+## Announce Release on Twitter
+
+The normal blah, blah, blah.