Add ability to match/assert on all the args at once

[timkindberg]

• New when.allArgs matcher. Instructs jest-when to hand over the full set of arguments to the matcher. This allows a dev to perform more complex matches, or in some cases write more succinct matching logic.

Closes #66

@mcous Can you please review and see if this might meet your needs? I have one test in particular that address your specific use case.

Still needs:

• [x] Documentation

[codecov-commenter]

Codecov Report

Merging #67 (3e7805b) into master (ea49d39) will not change coverage. The diff coverage is 100.00%.

:exclamation: Current head 3e7805b differs from pull request most recent head 7163307. Consider uploading reports for the commit 7163307 to get more accurate results

@@            Coverage Diff            @@
##            master       #67   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          108       116    +8     
=========================================
+ Hits           108       116    +8     

Impacted Files	Coverage Δ
src/when.js	100.00% <100.00%> (ø)

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[timkindberg]

@mcous I'm really liking this feature! Check out the documentation changes I made.