Type stable

[iintSjds]

• Fixed type stable problem caused by mesh.shift of uniform meshes.
  Now in getindex the mesh.shift is first converted to a SVector of T rather than of Rational.
• Added tests to check the return type of getindex.
• Also merged some changes(change version No. etc.) from master that's not yet updated in dev.
• And updated some tests with test_throws macro.

[codecov-commenter]

Codecov Report

Merging #77 (6d69025) into dev (5832c2a) will increase coverage by 0.04%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##              dev      #77      +/-   ##
==========================================
+ Coverage   78.94%   78.99%   +0.04%     
==========================================
  Files          16       16              
  Lines         969      971       +2     
==========================================
+ Hits          765      767       +2     
  Misses        204      204              

Impacted Files	Coverage Δ
src/BaseMesh.jl	95.74% <100.00%> (+0.18%)	⬆️

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