Properly handle poles in queryDiscRing

[ziotom78]

• [X] Add tests that reproduce issue #105
• [X] Properly handle north and south poles

[codecov[bot]]

Codecov Report

Merging #106 (d7a2a5c) into master (b3f41b3) will increase coverage by 1.13%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #106      +/-   ##
==========================================
+ Coverage   88.78%   89.91%   +1.13%     
==========================================
  Files          20       20              
  Lines        1328     1527     +199     
==========================================
+ Hits         1179     1373     +194     
- Misses        149      154       +5     

Impacted Files	Coverage Δ
src/query.jl	96.93% <100.00%> (+2.04%)	:arrow_up:
src/map_io.jl	89.79% <0.00%> (-0.62%)	:arrow_down:
src/map_pixelfunc.jl	91.02% <0.00%> (+0.48%)	:arrow_up:
src/pixelfunc.jl	90.24% <0.00%> (+0.50%)	:arrow_up:
src/resolution.jl	93.33% <0.00%> (+1.02%)	:arrow_up:
src/alm.jl	96.42% <0.00%> (+1.26%)	:arrow_up:

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