feat: Bails and Continues Modifiers

[logaretm]

This PR introduces a couple of directive modifiers to the v-validate directive:

• bails modifier: The field validation pipeline should stop at the first error.
• continues modifier: The field validation pipeline runs through till all rules are tested.

Both have higher priority over the fastExit configuration, which allows you to exclude specific fields from the global option.

<!-- This fields overrides the global fastExit option and forces the validation to stop after the first failure -->
<input type="text" name="bails" v-validate.bails="'required|min:3|is:3'">
<!-- This field overrides the global fastExit option and forces the validation to test all rules -->
<input type="text" name="continues" v-validate.continues="'required|min:3|is:3'">
<!-- This field doesn't specify so it will respect the global 'fastExit' option -->
<input type="text" name="undefined" v-validate="'required|min:3|is:3'">

closes #1358, closes #1337

[codecov]

Codecov Report

Merging #1451 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1451      +/-   ##
==========================================
+ Coverage   99.57%   99.58%   +<.01%     
==========================================
  Files          51       51              
  Lines        1663     1674      +11     
  Branches      543      549       +6     
==========================================
+ Hits         1656     1667      +11     
  Misses          7        7

Impacted Files	Coverage Δ
src/core/field.js	100% <100%> (ø)	⬆️
src/core/validator.js	100% <100%> (ø)	⬆️
src/core/resolver.js	99.13% <100%> (ø)	⬆️

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