Add isinside functionality

[dkarrasch]

Closes #95.

[codecov-commenter]

Codecov Report

Merging #96 (0cecea6) into master (1e5f5d1) will increase coverage by 0.29%.
The diff coverage is 95.45%.

@@            Coverage Diff             @@
##           master      #96      +/-   ##
==========================================
+ Coverage   54.40%   54.70%   +0.29%     
==========================================
  Files          17       17              
  Lines        3084     3106      +22     
==========================================
+ Hits         1678     1699      +21     
- Misses       1406     1407       +1     

Impacted Files	Coverage Δ
src/ellipticLCS.jl	84.34% <95.45%> (+0.36%)	⬆️

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