* master:
  Release 0.15.2
  [Bundle] Update.
  [Gemspec] Require Xcodeproj 0.3.5.
  Remove stray puts.
  Update the lockfiles of the examples.
  [Gemfile] Install and remove dependency on letters gem.
  [LocalPod] Always use Pathname::glob.
  [Gemspec] Use spermy indicator for xcodeproj.
  [Specs] Complete revert of 8e72cbe1
  Fixed a bug with the flags passed into `Dir.glob`
  Fixing a bug where `downcase` was being called on the list of used file paths
  Updated `clean_paths` and `expand_paths` methods to use `File::FNM_CASEFOLD`
  [Linter/Push] Properly singularize words in output.
  [Bundler] Update.
  [UI] Support for running CocoaPods without a terminal.
  [Git] Force a barebone repo for the cache.
  [Git] Code clean up.
  [LocalPod] Fixing clean paths

Conflicts:
	lib/cocoapods/local_pod.rb

Letters was causing issues with the colored gem and apparently is not supported
on 1.8.7.

This patch also removes the custom Pathname.glob based on Dir::glob.

Related #572 and #602.

Clean paths fix

This change is an update to an earlier pull request to fix Issue
https://github.com/CocoaPods/CocoaPods/pull/572.

Closes #550.

Closes #577.
Closes #575.

Closes #581.
Closes #569.

Add support for .hh header files

Need to support .hh files as headers to use the live555 rtp library.
Followed the pattern of this commit:

https://github.com/CocoaPods/CocoaPods/commit/f7587b16ffae55138df5a62949c2cc3ff2b98fae

That fixed issue #244 solving the same situation for .hpp headers.