Useful combinators

[noelmarkham]

Useful combinators for:

• Ordering pairs
• Distinct pairs
• Ordered lists

Plus tests.

@raulraja @juanpedromoreno would you be able to take a look please?

[codecov-io]

Codecov Report

Merging #51 into master will decrease coverage by 13.99%.
The diff coverage is 100%.

@@           Coverage Diff            @@
##           master      #51    +/-   ##
========================================
- Coverage   97.16%   83.17%   -14%     
========================================
  Files          10       10            
  Lines         106      107     +1     
  Branches        0        4     +4     
========================================
- Hits          103       89    -14     
- Misses          3       18    +15

Impacted Files	Coverage Δ
...ysevendeg/scalacheck/combinators/Combinators.scala	100% <100%> (ø)	⬆️
...ysevendeg/scalacheck/datetime/instances/jdk8.scala	0% <0%> (-100%)	⬇️
...scalacheck/datetime/jdk8/granularity/package.scala	73.33% <0%> (-26.67%)	⬇️
...scalacheck/datetime/joda/granularity/package.scala	73.33% <0%> (-26.67%)	⬇️
...rtysevendeg/scalacheck/datetime/joda/GenJoda.scala	76% <0%> (-18.45%)	⬇️
...ysevendeg/scalacheck/datetime/instances/joda.scala	100% <0%> (ø)	⬆️
...ala/com/fortysevendeg/scalacheck/magic/Magic.scala	100% <0%> (ø)	⬆️
...rtysevendeg/scalacheck/datetime/jdk8/GenJdk8.scala	100% <0%> (ø)	⬆️
...ortysevendeg/scalacheck/datetime/Granularity.scala	100% <0%> (ø)	⬆️
... and 1 more

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[juanpedromoreno]

Looks good, seems like you need to rebase from master though :)

Hopefully, the test coverage will increase, it's weird we're decreasing it ~14%