Update motion-cocoapods in order to fix build error

This patch should fix the following build error.

	% bundle exec rake
	Could not find rake-10.1.0 in any of the sources
	Run `bundle install` to install missing gems.
	rake aborted!
	[!] Unable to satisfy the following requirements:
	- `TTTAttributedLabel (from `git@github.com:mattt/TTTAttributedLabel.git`)` required by `Podfile`
	/Users/watson/src/github/HBFav2/Rakefile:60:in `block in <top (required)>'
	/Library/RubyMotion/lib/motion/project/config.rb:109:in `call'
	/Library/RubyMotion/lib/motion/project/config.rb:109:in `block in setup'
	/Library/RubyMotion/lib/motion/project/config.rb:109:in `each'
	/Library/RubyMotion/lib/motion/project/config.rb:109:in `setup'
	/Library/RubyMotion/lib/motion/project/app.rb:64:in `config'
	/Library/RubyMotion/lib/motion/project/template/ios.rb:44:in `block (2 levels) in <top (required)>'
	/Library/RubyMotion/lib/motion/project/template/ios.rb:63:in `block in <top (required)>'
	Tasks: TOP => build:simulator
	(See full trace by running task with --trace)

https://github.com/naoya/HBFav2/commit/6acf1d48f4f27b6f18d1af98d63afc74bffcc141 で CocoaPods のバージョンを上げられたことで、motion-cocoapods と整合性がとれずにビルドに失敗するようです。