automation of downloading data from AVRIS-NG

[ahuerta33]

Created new file to automatically download all directories and respective files on the AVRIS-NG site to local user's computer.

[lewismc]

@ahuerta33 thanks for opening the PR. A few comments

• as we discussed on last weeks calls, this code should live in crawler/src/main/resources/bin
• it is fine that it has been implemented as Python however you need to make sure that the version of Python is explicit... right now for example, the file does not run under Python 3.X as print $something is not supported. It would need to be print(something) e.g. a function call rather than a command.
• This script needs to be configurable, such that we can download any directory from the FTP server. It would be good to provide some command line options. For example we will at some stage wish to download data from other directories other than ftp://avng.jpl.nasa.gov/AVNG_2015_data_distribution/L2/

[lewismc]

Also, @ahuerta33 please always label your issues with the correct options.