Remove TableTools_JUI.css file from project

Hi,

Using Bootstrap (2 and 3) the print_info message and title are not visible.

Example:
![before](https://cloud.githubusercontent.com/assets/4895808/3536894/a4ca9122-0817-11e4-9cd8-af2d8e770c3d.png)

Looking at TableTools project, the message is showing correctly: http://live.datatables.net/pugunit/1

After some analysis (like issue #109 and #110) I found out that this problem was caused due to the TableTools reformulation on version 2.2.0 (see commit https://github.com/DataTables/TableTools/commit/994084637928701d4bce4d9e289b35ed540a53e7 for more details).

In my case, this problem was happening because I was calling TableTools_JUI (with deprecated code) after dataTables.tableTools (with the TableTools up to date code) in my `application.css` file, like this:
```
 *= require dataTables/bootstrap/3/jquery.dataTables.bootstrap
 *= require dataTables/extras/dataTables.tableTools
 *= require dataTables/extras/TableTools_JUI
```

Taking that into consideration, this PR removes outdated file `TableTools_JUI.css`, since the correct (and up to date) css code is defined on file `dataTables.tableTools.css.scss`.

After this change print_info message gets its normal look and feel:
![after](https://cloud.githubusercontent.com/assets/4895808/3539018/df1cfba2-0836-11e4-9442-2c8485fe04a0.png)


Thank you!