Update README with note on `project.el` and update version number.

Merge pull request #11 from lerouxrgd/minibuffer-layout

Fix minibuffer cleanup when layout is changed during current session

Update version number to 1.2

Properly check if one is in a project before calling `projectile-proj…

…ect-buffers`.

`projectile-project-buffers` now asks the user for a project to switch to if one
is not inside a project. Since this interferes with buffer switching, `nswbuff`
should properly check if the user is inside a project or not.

Add option to place nswbuff status window at the top of the current w…

…indow.

- new user option `nswbuff-status-window-at-top`
- rename option `nswbuff-window-max-height` to
  `nswbuff-status-window-max-height` for consistency.
- set background color of status window to inherit from `highlight` face.
- set `nswbuff-current-buffer-face` to inherit from `font-lock-keyword-face`.
- add `nswbuff-get-status-buffer` to get or create the status buffer.
- update version number to 1.1.