committing changes in /etc after apt run

Package changes:
-chromium-libpdf 33.0.1750.3-1
+chromium-libpdf 33.0.1750.5-1
-etckeeper 1.10-1
+etckeeper 1.11-1
-sublime-text-dev 3.3047-1
+sublime-text-dev 3.3059-1
-virtualbox-ext-oracle 4.3.4-1
+virtualbox-ext-oracle 4.3.6-1
-zotero 4.0.16-4
+zotero 4.0.17-1