Revert "Update README.md"

This reverts commit b53228d355d681009a027a623b3037f26d586d5d.

Conflicts:
	README.md
Revert "JRuby and Rails 4.1.6 Initialize"
JRuby 搭配Rails 在部署階段很多問題，回復原本CRuby版本

This reverts commit 88b614c1dc39d98e40c9cc77a00edba1f92dca12.

Conflicts:
	README.md
升級Rails 4.1.6