Use python script to calibrate depth

* subscribe depth_image_error/output
* plot the values
* dump the parameters into launch file
* remove R script before I added

![screenshot_from_2014-10-24 03 03 14](https://cloud.githubusercontent.com/assets/40454/4758401/20ac47f8-5adf-11e4-94a9-789e4fbbe1d9.png)