[DOC] Update refs and http

[rmarkello]

Closes #37.

Also updates all http references to https.

[codecov-io]

Codecov Report

Merging #60 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #60   +/-   ##
=======================================
  Coverage   97.16%   97.16%           
=======================================
  Files          24       24           
  Lines         954      954           
=======================================
  Hits          927      927           
  Misses         27       27

Impacted Files	Coverage Δ
abagen/allen.py	99.07% <ø> (ø)	⬆️
abagen/info.py	100% <100%> (ø)	⬆️
abagen/datasets.py	97.67% <100%> (ø)	⬆️
abagen/mouse/utils.py	92.3% <100%> (ø)	⬆️

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[coveralls]

Pull Request Test Coverage Report for Build 218

• 3 of 3 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 97.17%

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Totals
Change from base Build 216:	0.0%
Covered Lines:	927
Relevant Lines:	954

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💛 - Coveralls