Intl dates

[cjbarth]

Add support for formatting dates using the Intl library. See #147 .

[codecov-io]

Codecov Report

Merging #292 (4210dd4) into master (d7ad51a) will decrease coverage by 0.54%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #292      +/-   ##
==========================================
- Coverage   39.08%   38.53%   -0.55%     
==========================================
  Files           8        8              
  Lines         394      397       +3     
==========================================
- Hits          154      153       -1     
- Misses        240      244       +4     

Impacted Files	Coverage Δ
lib/src/Gren.js	4.68% <0.00%> (-0.09%)	:arrow_down:
lib/src/_utils.js	95.65% <ø> (-0.07%)	:arrow_down:
lib/src/templates.js	50.00% <ø> (ø)

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