Add support for values with self-closing tags

[HyukjinKwon]

Same for #285 but I resolved conflicts here. Should credit to him.

Closes #285
Closes #156
Closes #92
Closes #190
Closes #276

[HyukjinKwon]

@BioQwer, I am sorry for the late response. It was LGTM. I manually resolved the conflict here. Few differences are I a little bit cleaned up and removed the change about allowing empty attribute prefixes. Maybe, we can do this in another PR.

It's quite core change so it took me a while to double check. Mind taking another look before merging it in?

[HyukjinKwon]

BTW, let me try to prepare the release only after the current open PRs. It's been delayed again and again.

[codecov-io]

Codecov Report

Merging #303 into master will increase coverage by 0.07%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #303      +/-   ##
==========================================
+ Coverage   88.46%   88.54%   +0.07%     
==========================================
  Files          14       14              
  Lines         728      733       +5     
  Branches       99       93       -6     
==========================================
+ Hits          644      649       +5     
  Misses         84       84

Impacted Files	Coverage Δ
...cala/com/databricks/spark/xml/XmlInputFormat.scala	94.4% <100%> (+0.18%)	⬆️
...la/com/databricks/spark/xml/util/InferSchema.scala	87.14% <100%> (ø)	⬆️
...m/databricks/spark/xml/parsers/StaxXmlParser.scala	97.08% <100%> (ø)	⬆️
...abricks/spark/xml/parsers/StaxXmlParserUtils.scala	97.87% <100%> (+0.04%)	⬆️
...in/scala/com/databricks/spark/xml/XmlOptions.scala	97.05% <100%> (ø)	⬆️

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[oshribr]

where can i find the last build, with this fixed?

[BioQwer]

@oshribr you can get here , build with this fixes.
it's my builds

[hunzinker]

Hi - Thanks for the great work! What's the timeline for uploading the artifact for build 0.4.2 to maven?

[ankit57]

Hi, I still do not see 0.4.2 on maven. Is there any ETA to it?

[HyukjinKwon]

It's currently blocked by #321

We should fix the tests before the release