fix missing fold/unfold button issue and update for .gitignore/README.md/rm *.pyc files

#### fix missing fold/unfold button issue
in odoo v8, the fold/unfold button is missing, since it can not be inserted by qweb t-extend="WebClient",
so move the it to the extra.xml

#### add .gitignore/rm *.pyc files
* add .gitignore 
* remove __init__.pyc

#### update README.md add Installation
the module only works when the addon folder name is vhr_web_extra.