Started writing script to download ACE files from NNDC site.
Check for file already downloaded. Rename xsdir.
Merge branch 'develop' into nndc-data
Updated data processing and viz documentation to include examples
Merge pull request #239 from mit-crpg/doc_update

Updated data processing and viz documentation to include examples
Extract files to subdirectories. Add pre-generated cross_sections.xml.
Update installation guide with information about NNDC data.
Merge branch 'develop' into nndc-data
Updated data/readme.rst.
Added HDF5 files to .gitignore.
Ask user to delete downloaded tgz files.
Make get_nndc_data.py compatible with Python 3.
Merge pull request #240 from mit-crpg/nndc-data

Add Python script to automatically download NNDC ACE format data
Merge branch 'develop' into source_interval
updated documentation
deleted unused data file
updated results file for source point latest test
added cleanup script to remove all binary files from directories
fixed deleting binary files
restructured sourcepoint restart test