Adds ENDF/B-VII.1 (emission probability and half-life) data and JEFF-3.1.1 (cumulative fission yield) data

[LukeSeifert]

Summary of changes

The changes include addition of more data pulled in with the data download bash script, as well as two new examples that make use of this new data. This addition is part of my proposed work (addition of more datasets), though there are more datasets that will need to be added. This data was added now in order to get an initial estimate for the effects of varying datasets.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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