[Sandbox] Allow reads on `/`.

This is required by `xcodebuild` when it builds a resource bundle
target. I have no idea why it needs to do that...
[Sandbox] Use a few more literal paths instead of regexps.
[Gemspec] Add changelog as post install message

Closes #853
Merge branch 'master' of https://github.com/onato/CocoaPods into onato-master

* 'master' of https://github.com/onato/CocoaPods:
  * Modified so that rsync copies all files in one command.
[CopyResourcesScript] Minor cleanup
[CopyResourcesScript] Touch resources-to-copy.txt
[Fixtures] Update for changes to CopyResourcesScript
Changelog
[Gemspec] Fix encoding issues
[Gemspec] Fix for Ruby 1.9.3
[Config] Detect Podfile in parent dirs

Closes #940
[Sandbox] Store list of pods in head mode

Closes #1046
Closes #1039
[Downloader] Load instead of autoloading to ensure that the overrides work
[Config] Use the pwd as installation root if no Podfile can be found
Prepare for 0.20.0 release
Release 0.20.0
[Gemspec] Require CLAide 0.3.1

Previous version didn't include all the files in lib
[Config] Fix space before parentheses
[Gemspec] Make sandbox-pod executable visible
[Sandbox] Fix issues when installed as a gem.