Add spring-webflux compatibility to handlebars-springmvc (#642)

[shortstories]

• update spring version (3.1.1.RELEASE -> 5.0.7.RELEASE)
• add spring-webflux
• update Junit version (4.11 -> 4.12)
• add handlebar spring reactive view and view resolver
  • ReactiveHandlebarsView
  • ReactiveHandlebarsViewResolver
  • And their tests...

[codecov-io]

Codecov Report

Merging #647 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #647      +/-   ##
============================================
- Coverage     87.33%   87.28%   -0.05%     
+ Complexity      841      833       -8     
============================================
  Files            78       78              
  Lines          3023     2989      -34     
  Branches        411      407       -4     
============================================
- Hits           2640     2609      -31     
+ Misses          261      260       -1     
+ Partials        122      120       -2

Impacted Files	Coverage Δ	Complexity Δ
...knack/handlebars/helper/DefaultHelperRegistry.java	74.48% <0%> (-2.15%)	20% <0%> (-2%)
...hub/jknack/handlebars/internal/FormatterChain.java	85.71% <0%> (-1.79%)	4% <0%> (-1%)
...ain/java/com/github/jknack/handlebars/Context.java	94.68% <0%> (-0.2%)	37% <0%> (ø)
...ub/jknack/handlebars/internal/TemplateBuilder.java	88.15% <0%> (-0.04%)	88% <0%> (ø)
...com/github/jknack/handlebars/internal/Partial.java	93.27% <0%> (+1.48%)	31% <0%> (-5%)	⬇️

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[coveralls]

Coverage remained the same at 91.301% when pulling f142a6b on shortstories:master into 3b702a4 on jknack:master.

[jknack]

Looks good with one question.

Is Spring 5.x compatible with 3.x?

I know 3.x is old (very old) but don't want to break existing integrations

[shortstories]

I created a Spring3 test project (https://github.com/shortstories/spring3-mvc-maven-xml-hello-world) and tried to run it. It works without problems.

[nikos]

@jknack any chances this PR could be revitalized, so that Spring Webflux with Handlebars becomes available?

[codecov-commenter]

Codecov Report

Merging #647 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #647   +/-   ##
=========================================
  Coverage     87.28%   87.28%           
  Complexity      833      833           
=========================================
  Files            78       78           
  Lines          2989     2989           
  Branches        407      407           
=========================================
  Hits           2609     2609           
  Misses          260      260           
  Partials        120      120           

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[IRuzhnikov]

HI! how i can help for push it to master? Because it's really actual for me)