Multiple diversity types, speed-up, Julia v1.0!

[richardreeve]

• Report on diversity type in output
• Update sub-packages and docs
• Output necessary parameters to disambiguate
• Speed up as we're taking too long to do diversity calculations for big systems
• Working with Julia v1.0
• Allow multiple diversities to be measured simultaneously

[codecov]

Codecov Report

Merging #27 into master will decrease coverage by 5.94%.
The diff coverage is 80.48%.

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
- Coverage   94.38%   88.43%   -5.95%     
==========================================
  Files          14       14              
  Lines         374      441      +67     
==========================================
+ Hits          353      390      +37     
- Misses         21       51      +30

Impacted Files	Coverage Δ
src/GeneralisedDiversities.jl	100% <ø> (ø)	⬆️
src/Diversity.jl	16.66% <0%> (-83.34%)	⬇️
src/Iterators.jl	52.63% <0%> (-9.87%)	⬇️
src/Metacommunity.jl	93.93% <100%> (ø)	⬆️
src/Ecology.jl	100% <100%> (ø)	⬆️
src/Jost.jl	100% <100%> (ø)	⬆️
src/Hill.jl	100% <100%> (ø)	⬆️
src/EffectiveNumbers.jl	100% <100%> (ø)	⬆️
src/Interface.jl	89.65% <50%> (-1.65%)	⬇️
src/DiversityMeasure.jl	89.65% <76.47%> (-10.35%)	⬇️
... and 5 more

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[richardreeve]

Fixes #26.

[coveralls]

Coverage decreased (-5.9%) to 88.435% when pulling 415a46b on multiple into ef0a4d5 on master.