fix #1789: remove call to invalidate in onScroll callback
Merge pull request #1792 from wordpress-mobile/issue/1789-npe-wpaction-bar

fix #1789: remove call to invalidate in onScroll callback
Changed getResources() to context.getResources() to avoid IllegalStateException accessing resources before fragment has been added
Merge pull request #1793 from wordpress-mobile/issue/1790-illegalstate-reader-detail

issue/1790-illegalstate-reader-detail
3.1 version bump
EOL issue on gradlew
minor tools/release-checks.sh fixes
strings update
Merge branch 'release/3.1' into develop

Conflicts:
	WordPress/src/main/java/org/wordpress/android/ui/reader/ReaderPostDetailFragment.java