Bugfix: Better Day.shouldComponentUpdate implementation and exporting…

[oigewan]

Bugs:
Fixes #446

The Day.shouldComponentUpdate method was not allowing days to update when anything other than modifiers changed. This can lead to buggy behavior if many public props of DayPicker change.

Also, the NavbarPropTypes and WeekdayPropTypes were being exported incorrectly starting here: 0b5a46f

Changes:

• Export propTypes directly off of components inside of DayPicker.js where appropriate.
• For most props in Day, do a shallow compare to determine the return value of shouldComponentUpdate. However, modifiers and modifiersStyles need their own shallow compare as well, so make an exception for them.

cc: @gpbl

[codecov]

Codecov Report

Merging #452 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #452   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          15     15           
  Lines         512    528   +16     
  Branches      104    109    +5     
=====================================
+ Hits          512    528   +16

Impacted Files	Coverage Δ
src/Day.js	100% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update dd54b02...950134f. Read the comment docs.

[gpbl]

Thanks! 🌈