[Gemfile] Use Genshin/GAKUEngine repo for GAKUEngine gem
Rename README.rdoc to README.md
[README] Add requirements section
Merge branch 'rails4'

Conflicts:
	Gemfile
[README] Min version for ruby: 2.0.0
Change ruby-gemset to gaku
modified cap files for test deploy
Merge pull request #1 from Kagetsuki/master

modified cap files for test deploy
improve vagrant
Merge branch 'improve_vagrant'