Log Message:
Update ruby-spreadsheet to 1.1.0.

### 1.1.0 / 08.12.2015

Author: Matthew Boeh <matt@crowdcompass.com>
Date:   Mon Dec 7 11:18:55 2015 -0800

* Disregard locale indicators when determining whether a cell contains a
  date/time.

### 1.0.9 / 18.11.2015

Author: 545ch4 <s@rprojekt.org>
Date:   Mon Nov 16 10:26:27 2015 +0100

* Add smart method compact! to worksheet
* Use compact! to reduce the number of rows and columns by striping empty one
  at both ends.

### 1.0.8 / 20.10.2015

commit e9bd1dd34998803b63460f4951e9aa34e569bd8f
Author: Pierre Laprée <pilap82@users.noreply.github.com>
Date:   Tue Oct 20 03:12:22 2015 +0200

* Remove stray `puts`
* A `puts` instruction pollutes the log and doesn't serve any purpose. As
  such, we propose its removal.