Merge 2.8 release with master (#1887)

* Add Traceur for getting meaningful RxJava stack traces (#1832)

* Hotfix for overwrite issue in 2.8.0  (#1838)

* This solution is an hotfix for overrite issue came back on 2.8.0 version. What I did is checking the extension, and if it is null, adding .jpg suffix. Because commons files always have suffixes, and we should compare file names after adding suffixes. Othervise overrides are possible.

* Check if file title includes an extension already, by checking if is there any dot in it.

* Fix logic error

* Add uncovered tests

* Remove unecessary line breaks

* Make Javadocs more explicit

* Versioning and changelog for v2.8.2 (#1842)

* Versioning for v2.8.2

* Changelog for v2.8.2

* Add logs in wiki data edit and session refresh flow (#1874)

* Fix logout (#1875)

* [WIP] Refactor feedback and quiz to reduce possibility of NPE (#1881)

* Refactor feedback and quiz to reduce possibility of NPE

* Handle throwables in quiz checker

* Minor refactoring

* Set Traceur to only work in DEBUG mode (#1884)

* Bug fix for uploaded images count in achievements activity (#1885)

* Versioning and changelog for v2.8.3 (#1886)

* Update changelog.md

* Versioning for v2.8.3

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Wikimedia Commons for Android
 
+## v2.8.3
+- Fixed issues with session tokens not being cleared in 2FA, which should reduce p18 edit failures as well
+- Fixed crash caused by bug in fetching revert count
+- Fixed crash potentially caused by Traceur library
+
+## v2.8.2
+- Fixed bug with uploads sent via Share being given .jpeg extensions and overwriting files of the same name
+
 ## v2.8.1
 - Fixed bug with category edits not being sent to server