Utils pr#17

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kyr-pol wants to merge 3 commits intomasterfrom

Commits on Jan 7, 2019

Moved wrappers to utils, added save and load functions
kyr-pol
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Commits on Jan 10, 2019

Saved num_induced_points separately, added a test for the sparse case
kyr-pol
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Cleaned up files created from test_load_save.py, updated .gitignore
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