Vim-CtrlSpace 4.0

Hello :)

Here is the new big release of Vim-CtrlSpace. The most important changes have been listed [here](https://github.com/szw/vim-ctrlspace/tree/next#changes-in-version-40). There is also a new movie, new logo, a bit refreshed user interface, rewrited docs. 

Hope you like it. Any feedback will be appreciated :).

Kind regards

szw