Bump rouge to 1.10 to remove warning noise and fix other syntax highlighting bugs

Closes #2128

Closes #2433

CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 
 v 8.0.0 (unreleased)
+  - Bump rouge to 1.10 to remove warning noise and fix other syntax highlighting bugs (Stan Hu)
   - Gracefully handle errors in syntax highlighting by leaving the block unformatted (Stan Hu)
   - Fix URL construction for merge requests, issues, notes, and commits for relative URL config (Stan Hu)
   - Fix emoji URLs in Markdown when relative_url_root is used (Stan Hu)

Gemfile.lock

@@ -291,7 +291,7 @@ GEM
       github-markup (~> 1.3.1)
       gollum-grit_adapter (~> 0.1, >= 0.1.1)
       nokogiri (~> 1.6.4)
-      rouge (~> 1.9)
+      rouge (~> 1.10)
       sanitize (~> 2.1.0)
       stringex (~> 2.5.1)
     gon (5.0.1)
@@ -544,7 +544,7 @@ GEM
       netrc (~> 0.7)
     rinku (1.7.3)
     rotp (1.6.1)
-    rouge (1.9.1)
+    rouge (1.10.0)
     rqrcode (0.4.2)
     rqrcode-rails3 (0.1.7)
       rqrcode (>= 0.4.2)