Add polar operation

[blegat]

No description provided.

[coveralls]

Coverage decreased (-3.5%) to 80.869% when pulling a5b5f3f on bl/polar into 485f7df on master.

[codecov]

Codecov Report

Merging #219 (99eff80) into master (12379c7) will increase coverage by 0.05%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##           master     #219      +/-   ##
==========================================
+ Coverage   89.45%   89.51%   +0.05%     
==========================================
  Files          38       38              
  Lines        2333     2355      +22     
==========================================
+ Hits         2087     2108      +21     
- Misses        246      247       +1     

Impacted Files	Coverage Δ
src/Polyhedra.jl	84.00% <ø> (ø)
src/vecrep.jl	100.00% <ø> (ø)
src/repop.jl	91.45% <90.90%> (+0.92%)	⬆️

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