Update buildscript and wrapper.

[rosolko]

Proposed changes

First iteration of gradle update:

• Update gradle wrapper to use native non custom paths and scripts.
• Update travis ci scripts.
• Migrate to new gradle dependencies endpoints.
• Clean-up deploy buildscript.
• Remove pitest because unused.
• Migrate from findbugs to spotbugs.

Next step: Refactor code style script and update code related to changes.

Checklist

• Checkstyle and unit tests pass locally with my changes by running gradle check chrome htmlunit command
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[codecov-io]

Codecov Report

Merging #707 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #707      +/-   ##
============================================
+ Coverage     61.87%   61.88%   +0.01%     
+ Complexity      825      824       -1     
============================================
  Files           154      154              
  Lines          2888     2881       -7     
  Branches        284      281       -3     
============================================
- Hits           1787     1783       -4     
+ Misses          993      992       -1     
+ Partials        108      106       -2

Impacted Files	Coverage Δ	Complexity Δ
...e/selenide/impl/WebDriverThreadLocalContainer.java	81.61% <0%> (-1.48%)	30% <0%> (-1%)
...rne/selenide/impl/DownloadFileWithHttpRequest.java	80% <0%> (-0.29%)	13% <0%> (ø)
...rne/selenide/impl/DownloadFileWithProxyServer.java	94.73% <0%> (-0.14%)	9% <0%> (ø)
.../codeborne/selenide/impl/ScreenShotLaboratory.java	56.06% <0%> (+1.57%)	34% <0%> (ø)	⬇️

---

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[coveralls]

Coverage decreased (-0.05%) to 65.568% when pulling 4ee4eba on rosolko:gradle into 112ccad on codeborne:master.

[BorisOsipov]

Thanks @rosolko!
LGTM.

[BorisOsipov]

Two minor questions

1. What do you mean "Next step: Refactor code style script and update code related to changes."? which changes are you talking about?
2. @rosolko @asolntsev What about pitest? can't we enable it again?

[rosolko]

@BorisOsipov

1. Add pmd, errorprone and sonarqube.
   Use more checkstyle rules.
   Investigate if it's possible to simplify config.
   Move code quality tasks and configs to separate script?
   Style code after new tools and configs.

2. As discussed with @asolntsev pitests ran few times just for fun and not on regular base, so consider to remove.

[asolntsev]

@BorisOsipov Yes, a long time ago I tried PiTest. Generally, it would be good to run mutation tests. But de-facto I never run them. It's hard to analyze them because they give too many false results.

But feel free to restore them. :)