Missing runtime dependency - eigen_conversions

`libdepth_image_proc` is missing this dependency at runtime

```
> ldd libdepth_image_proc.so  | grep eigen
        libeigen_conversions.so => not found
```

Which causes the following error on loading depth_image_proc:

```
[ INFO] [1402564815.530736554]: /camera/rgb/camera_info -> /camera/rgb/camera_info
[ERROR] [1402564815.727176562]: Failed to load nodelet [/camera/depth_metric_rect] of type
 [depth_image_proc/convert_metric]: Failed to load library /opt/ros/indigo/lib//libdepth_image_proc.so.
 Make sure that you are calling the PLUGINLIB_EXPORT_CLASS macro in the library code, and that
 names are consistent between this macro and your XML. Error string: Could not load library (Poco
 exception = libeigen_conversions.so: cannot open shared object file: No such file or directory)
[FATAL] [1402564815.727410623]: Service call failed!
```
Merge pull request #79 from stonier/patch-1

Missing runtime dependency - eigen_conversions
also print self.report() on calibrate ... allows to use the params without having to commit them (e.g. for extrensic calibration between to cameras not used as stereo pair)
Merge pull request #82 from andreasBihlmaier/indigo

also print self.report() on calibrate ... allows to use the params witho...
small speedups
remove GTK dependency