Update version in React.podspec and package.json

Bump to 0.8.0

0.8.0-rc.2

- Suppressed TextInput.props warning
- Reverted layout-only UIView removal
- Reverted scroll view sticky header fix related to UIView removal

Update version numbers in package.json and React.podspec to 0.8.0-rc

Update package.json and React.podspec to 0.7.1

[dist] Update package.json and CocoaPods versions to 0.7.0-rc.2

This release includes a fix for ListViews so that they no longer produce a redbox. The versioning uses the "rc.#" style that http://semver.org/ uses.

Also went back to using tags for CocoaPods. Will create the git tag v0.7.0-rc.2 that points to this commit.

[Podspec] Update for 0.7.0-rc

[Package.json] 0.6.0

0.6.0-rc

0.5.0