Add support for dot product between density matrices

[codecov[bot]]

Codecov Report

Merging #111 (752b8eb) into master (884541f) will decrease coverage by 21.57%. The diff coverage is 100.00%.

:exclamation: Current head 752b8eb differs from pull request most recent head 74ef309. Consider uploading reports for the commit 74ef309 to get more accurate results

@@             Coverage Diff             @@
##           master     #111       +/-   ##
===========================================
- Coverage   97.81%   76.23%   -21.58%     
===========================================
  Files          21       19        -2     
  Lines        2426     2466       +40     
===========================================
- Hits         2373     1880      -493     
- Misses         53      586      +533     

Impacted Files	Coverage Δ
src/density_matrix.jl	87.09% <100.00%> (-12.91%)	:arrow_down:
src/openqasm/gate_transformers.jl	3.38% <0.00%> (-52.87%)	:arrow_down:
src/openqasm/register.jl	46.15% <0.00%> (-50.99%)	:arrow_down:
src/util.jl	76.31% <0.00%> (-22.61%)	:arrow_down:
src/circuit.jl	75.54% <0.00%> (-20.79%)	:arrow_down:
src/circuitgate.jl	79.74% <0.00%> (-19.05%)	:arrow_down:
src/openqasm/transform_cgc.jl	81.81% <0.00%> (-18.19%)	:arrow_down:
src/view.jl	79.46% <0.00%> (-17.84%)	:arrow_down:
src/openqasm/transform_qasm.jl	76.59% <0.00%> (-17.76%)	:arrow_down:
src/unitary2circuit.jl	85.23% <0.00%> (-14.38%)	:arrow_down:
... and 12 more

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