Fix issues around pasting into ReactCodeInput

[acusti]

note that this branch was branched off of #153 and will be easier to review in isolation from those changes.

---

fixed some issues around pasting, including:

• Update focus to input after last pasted value or last input, fix #70 631bae4
• Use type="text" when props.type is 'number' to avoid browser bugs b65e90e
  • fixes #62 (reproducible in chrome and safari also)
  • removes need for special keydown handling for ↑/↓/E keys
  • removes need for extra styles to remove default input type="number" browser styles
  • leaves filtering of non-numeric values to existing logic in the component’s handleChange method. this works for both pasted text and keyboard entry thanks to the input type being text; when input type is number, paste doesn’t trigger a react onChange event and it is impossible to get the behavior 100% correct (inputElement.value is empty even when it actually has characters in it, e.g. the letter e)
• Remove maxLength from the inputs so filtered pasted values aren’t truncated 3403072
  • when using maxLength, if user has copied the text "123 456" and pastes it into an input rendered by ReactCodeInput with fields={6}, the last digit (“6”) won’t be pasted because the max length on the focused input is 6 digits

[codecov[bot]]

Codecov Report

Merging #154 (1236d1f) into master (2599c5d) will increase coverage by 1.15%. The diff coverage is n/a.

:exclamation: Current head 1236d1f differs from pull request most recent head 3403072. Consider uploading reports for the commit 3403072 to get more accurate results

@@            Coverage Diff             @@
##           master     #154      +/-   ##
==========================================
+ Coverage   96.55%   97.70%   +1.15%     
==========================================
  Files           2        2              
  Lines         145      131      -14     
  Branches       41       35       -6     
==========================================
- Hits          140      128      -12     
+ Misses          5        3       -2     

Impacted Files	Coverage Δ
src/ReactCodeInput.js
src/utils.js
utils.js	100.00% <0.00%> (ø)
ReactCodeInput.js	97.63% <0.00%> (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 2599c5d...3403072. Read the comment docs.