Update hamiltonians.jl

[marwahaha]

I made a number of comments to hamiltonians.jl .

My main comments are:

• I think you should have a few more functions (if you find yourself saying "it does this if otherwise " then there should be two functions)
• have a consistent way to write what each function returns (it's hard to parse from the explanatory text on top)
• explain what your temp variables mean

[codecov[bot]]

Codecov Report

Merging #52 (1983cba) into master (4630f9d) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #52   +/-   ##
=======================================
  Coverage   97.09%   97.09%           
=======================================
  Files          11       11           
  Lines         964      964           
=======================================
  Hits          936      936           
  Misses         28       28           

Impacted Files	Coverage Δ
src/hamiltonians.jl	93.73% <100.00%> (ø)

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[jbroz11]

We will be changing this code a bit when we add in arb rotating frame transformation capability, so this is no longer relevant.