Migrate project to Kotlin

[vmadalin]

Original PR

https://github.com/googlesamples/easypermissions/pull/289

Description

Migrate all entire project to Kotlin 1.3.50, but keeping the integration concept. These are some of the things that have been done:

• Migrate entire sample to kotlin
• Make the library more modular by structure better the files / code
• Add a project logo, make more easy to identify it
• Add severals tools like ktlint, detekt, spotless for static analysis code adding them to Travis
• Migrate all the tests to kotlin, for guaranty the coverage for new code
• Simplify logic about Rationale/Settings dialogs displaying an AlertDialog
• Eradicate LowAPiPermissions for avoid throw exception to integrator on their code

Overview

• Architecture:

  

• Coverage:

  

[codecov[bot]]

Codecov Report

Merging #1 (34ad7bb) into master (3a3d595) will increase coverage by 54.18%. The diff coverage is 54.18%.

@@             Coverage Diff             @@
##           master       #1       +/-   ##
===========================================
+ Coverage    0.00%   54.18%   +54.18%     
===========================================
  Files          14        9        -5     
  Lines         486      227      -259     
  Branches       58       46       -12     
===========================================
+ Hits            0      123      +123     
+ Misses        486       81      -405     
- Partials        0       23       +23     

Impacted Files	Coverage Δ
...vmadalin/easypermissions/dialogs/SettingsDialog.kt	0.00% <0.00%> (ø)
...vmadalin/easypermissions/utils/AnnotationsUtils.kt	41.66% <41.66%> (ø)
...adalin/easypermissions/models/PermissionRequest.kt	48.88% <48.88%> (ø)
...madalin/easypermissions/dialogs/RationaleDialog.kt	53.12% <53.12%> (ø)
...sypermissions/helpers/FragmentPermissionsHelper.kt	85.71% <85.71%> (ø)
...va/com/vmadalin/easypermissions/EasyPermissions.kt	89.79% <89.79%> (ø)
.../easypermissions/helpers/base/PermissionsHelper.kt	92.30% <92.30%> (ø)
...sypermissions/helpers/ActivityPermissionsHelper.kt	100.00% <100.00%> (ø)
...ions/helpers/AppCompatActivityPermissionsHelper.kt	100.00% <100.00%> (ø)
... and 8 more

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