Maximize windows that match the work area

Many applications are buggy: they save the bounds of their window for the next time, but not the maximized state. When you close such an app that is maximized, the next time a window opens that covers the exact size  of the work area, but is not maximized.

An example is Chromium; this is how it opens:

![Chromium, unmaximized](https://cloud.githubusercontent.com/assets/1177304/3749187/1c6e2f64-17e9-11e4-80d9-31cd7f084e57.png)

In these cases (a maximizable window shows up with a size set to the exact bounds of the work area), the window is automatically maximized. After the change, Chromium shows up as expected:

![Chromium, maximized](https://cloud.githubusercontent.com/assets/1177304/3749199/36030d6e-17e9-11e4-88c7-916b27def2bd.png)

Please note that, unless the irritating auto-maximize feature that was [removed long time ago](https://github.com/linuxmint/muffin/commit/16d5335ee9d5c4a48e214e98c18f896c1049e09a), this feature is really strict and should go unnoticed for most users. A setting can be created to turn it off, though.