Add extension options to toggle report formats

[bskim45]

This exposes a report format option to the extension class, so that users can enable/disable certain format.

junitJacoco {
  jacocoVersion = '0.8.2' // type String
  ignoreProjects = [] // type String array
  excludes // type String List
  includeNoLocationClasses = false // type boolean
  includeInstrumentationCoverageInMergedReport = false // type boolean
  xml.enabled = true
  csv.enabled = true
  html.enabled = true
}

[codecov[bot]]

Codecov Report

Merging #181 into master will increase coverage by 0.33%. The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #181      +/-   ##
============================================
+ Coverage     84.15%   84.49%   +0.33%     
- Complexity       44       45       +1     
============================================
  Files             2        3       +1     
  Lines           183      187       +4     
  Branches         24       24              
============================================
+ Hits            154      158       +4     
  Misses           21       21              
  Partials          8        8              

Impacted Files	Coverage Δ	Complexity Δ
...ktech/android/junit/jacoco/GenerationPlugin.groovy	84.06% <100.00%> (ø)	43.00 <0.00> (ø)
...h/android/junit/jacoco/JunitJacocoExtension.groovy	100.00% <100.00%> (ø)	1.00 <0.00> (ø)
...anniktech/android/junit/jacoco/ReportConfig.groovy	100.00% <100.00%> (ø)	1.00 <1.00> (?)

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