Support for general index types

[dlfivefifty]

This is to support multi-dimensional bases

[codecov[bot]]

Codecov Report

Merging #27 into master will increase coverage by 3.02%. The diff coverage is 68.7%.

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   34.71%   37.74%   +3.02%     
==========================================
  Files          17       17              
  Lines        1230     1224       -6     
==========================================
+ Hits          427      462      +35     
+ Misses        803      762      -41

Impacted Files	Coverage Δ
src/QuasiArrays.jl	46.66% <ø> (ø)	:arrow_up:
src/quasiarray.jl	93.1% <100%> (ø)	:arrow_up:
src/abstractquasiarray.jl	34.24% <50%> (+2.53%)	:arrow_up:
src/multidimensional.jl	17.24% <56.25%> (-0.64%)	:arrow_down:
src/subquasiarray.jl	48.79% <72.88%> (+16.36%)	:arrow_up:
src/quasibroadcast.jl	45.58% <75%> (ø)	:arrow_up:
src/indices.jl	42.85% <82.35%> (+1.62%)	:arrow_up:

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[dlfivefifty]

@jagot This will likely be merged soon. It will make it possible to do multidimensional bases, e.g., I'm planning to create a SphericalHarmonics.jl package building on this

[jagot]

Cool! I would be interested in how this would work out for vector-valued functions, i.e. for problems of the kind discussed here: https://github.com/JuliaApproximation/ContinuumArrays.jl/issues/15#issuecomment-536941064

[dlfivefifty]

The failed tests are due to Travis