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travis-ci

build.gradle: add `buildJar`, update `archiveName` and dependencies (#107)

There are a few issues with the Gradle build script.
* Overlooked issues when building JAR file with `shadowJar`
  `shadowJar` simply bundles the `HelpWindow.html` without re-generating
  the docs first. This may cause the `Help` window of our application to
  display outdated details.

* `archiveName` is `addressbook.jar`, but should be `PWE.jar`
   Despite our User Guide mentioning `PWE.jar`, the JAR file created is
   by `shadowJar` is `addressbook.jar`. We should update the filename
   accordingly to suit our needs.

* Dependencies are out-of-date
  We should keep our dependencies up-to-date to fix bugs reported in the
  older releases of our dependencies.

* Lack of verbosity for `javac` linter warnings
  `javac` reports that the codebase used unchecked or unsafe operations.
   This may indicate potential bugs in our application.

To address these issues, let's update `build.gradle` by
* adding `buildJar` task to simplify the build process and ensuring that
  docs are regenerated first before building the JAR.
* update `archiveName` to `PWE.jar`
* update the out-of-date dependencies
* add `javac` arguments to increase verbosity of linter warnings so that
  we can fix the potential bugs

Note: After updating Jackson, `Path` objects are now deserialised as
      absolute paths, which causes some of the assertion tests to fail.
      As such, `commons/core/Config` & `model/UserPrefs` were updated
      accordingly to convert absolute paths back to relative paths so as
      to allow the assertion tests to pass again.

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