Various fixes to notebooks

* Some style related spacing, etc
* Removed un-needed print statements
* Removed use of print function
* Added cells on using radar.info and radar_info to first notebook.
* Changed data_dir to be the current directory unless overwritten.
added .gitignore file
added readme.md to ASR_PI_2014 directory
Merge pull request #4 from jjhelmus/master

Various improvements to the ASR 2014 notebooks