Adding clickable week number feature.

[sentient06]

Example:

<DatePicker
    showWeekNumbers
    onWeekSelect={(firstDayOfTheWeek, weekNumber) => {
        alert(firstDayOfTheWeek.format() + ', ' + weekNumber)
    }}
/>

[codecov-io]

Codecov Report

Merging #936 into master will decrease coverage by 0.6%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master     #936      +/-   ##
==========================================
- Coverage   85.99%   85.38%   -0.61%     
==========================================
  Files          12       12              
  Lines         614      616       +2     
  Branches      118      120       +2     
==========================================
- Hits          528      526       -2     
- Misses          3        6       +3     
- Partials       83       84       +1

Impacted Files	Coverage Δ
src/datepicker.jsx	91.71% <ø> (ø)	⬆️
src/calendar.jsx	87.96% <ø> (-0.43%)	⬇️
src/month.jsx	81.81% <100%> (-0.8%)	⬇️
src/week_number.jsx	35.71% <28.57%> (+2.38%)	⬆️
src/week.jsx	73.33% <66.66%> (-0.75%)	⬇️

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[alex-shamshurin]

Could you squash you commits into one-two and without merge commits?

[martijnrusschen]

I can squash on merge.

…

On Tue, 11 Jul 2017 at 10:27, Alexander Shamshurin ***@***.***> wrote: Could you squash you commits into one-two and without merge commits? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#936 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABWNKF2LJkxr1quFUHRdqoWTFZZf-h8Eks5sMzIPgaJpZM4OSpHY> .

[sentient06]

Should I create a new PR?