This package provides the environment fullwidth. 
The package was inspired by a question of stack exchange

This package provides the environment fullwidth which allows to
set the left and right margins in a very simple way. It also allows page breaks.
If you are using the twoside mode you can set the inner and outer margins.

see also: http://tex.stackexchange.com/questions/34368/how-to-switch-between-two-margin-sizes

Author's name: Marco Daniel 
version: 0.1a
