Enable the yasnippet for emacs

- Enable the yasnippet. Add default snippet dictionary
- Add custome snippet for latex mode
- Add readme description
- For detail: see readme file
Enable the yasnippet for emacs

- Enable the yasnippet. Add default snippet dictionary
- Add custome snippet for latex mode
- Add readme description
- For detail: see readme file
Merge branch 'master' of https://github.com/shan199105/config

Conflicts:
	README.md
Merge pull request #7 from shan199105/master

Enable the yasnippet for emacs