Fix issues on dashboard title and logo with AdminLTE

There is an issue when the logo image is too big and if the title is too long.

Here are the results before modifications:

![without_modification](https://cloud.githubusercontent.com/assets/1649453/3553347/7a0f3cb2-0902-11e4-95aa-678a4c76abe8.PNG)
![without_modification_2](https://cloud.githubusercontent.com/assets/1649453/3553355/8be76b6c-0902-11e4-8061-b32769b393a7.PNG)

By correcting the image size:
![logo_resized](https://cloud.githubusercontent.com/assets/1649453/3553364/a241860e-0902-11e4-830d-4bb292df80d3.PNG)

But there is still an issue with the title, which is also corrected by this pull request:
![logo_resized_title_corrected](https://cloud.githubusercontent.com/assets/1649453/3553381/b9a74fe0-0902-11e4-91d8-238e970e7bb9.PNG)

The title goes on two lines if it is too long and is always center.