Upgrade lint

[blakearnold]

Hi!
Not sure if this is the proper way to submit a patch, but FWIW:

I spent some time trying to get the Android Lint plugin up to speed with version 25.1.2 of android-lint.
This is somewhat of a WIP, but would love some feedback before investing too much more time.
This should fix #17.

Some notes:

• I modified some of the tests to specify a test-rules.xml so they are not fragile when the real rules.xml gets updated.
• export_reimport_should_end_up_with_same_quality_profile seemed to be failing even though it was reading in the test-rules.xml. I must have missed something so I've disabled the test for now.
• I'm not sure how to run the tests under its/plugin/projects, so it's probably broken.
• This also contains a bug fix to SonarRulesGenerator.java where it was not exporting the tags with the correct xml element
• Most of the updates to SQALE xml is a hack. The file should probably be cleaned up considering only remediationFunction and offset are used.

In my quick testing, it seems to be working.

-Blake

[benzonico]

You may want to use annotation @VisibleForTesting instead of a comment.

[benzonico]

As promised on the mailing list here is a few feedback about this PR.
See my inline comments.

Regarding :

Most of the updates to SQALE xml is a hack. The file should probably be cleaned up considering only remediationFunction and offset are used

Given that this sqale approach was dropped in latest LTS I would not bother too much with it.

Which brings me to the next point for maintainance of this plugin IMO : an effort should be made to upgrade this plugin to java 8 and the latest SQ LTS in order to drop deprecated APIs. (note this is unrelated to this PR directly but most probably required before releasing).

HTH, and good luck with the maintainance of this plugin !

[abvanpelt]

@tomverin Is this project still active?