Huge updates to the whole cosmology suite

[abatten]

• Cosmologies are now defined using astropy.cosmology
• Recreated all lookup tables using 0<z<20 and 1e4 samples
• Deleted old lookup tables since they use different
• Added e13Tools as requirement
• Deleted methods and cosmo strings from _fruitbatstrings
• Changed tests to work with new cosmology
• Accidentally made changes on doc branch

[codecov[bot]]

Codecov Report

Merging #6 into master will decrease coverage by 4.84%. The diff coverage is 88.48%.

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
- Coverage   98.28%   93.43%   -4.85%     
==========================================
  Files           7        7              
  Lines         350      381      +31     
==========================================
+ Hits          344      356      +12     
- Misses          6       25      +19

Impacted Files	Coverage Δ
fruitbat/_fruitbatstrings.py	100% <100%> (ø)	:arrow_up:
fruitbat/estimate.py	100% <100%> (ø)	:arrow_up:
fruitbat/tests/test_fruitbat.py	100% <100%> (+0.94%)	:arrow_up:
fruitbat/utils.py	98.33% <100%> (+1.23%)	:arrow_up:
fruitbat/cosmology.py	81.13% <80.76%> (-18.87%)	:arrow_down:
fruitbat/frb.py	89.85% <87.75%> (-6.49%)	:arrow_down:

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