Fix #4149, fix #1199 - Store emojis as unicode (#4189)

- Use unicode when selecting emoji through picker
- Convert shortcodes to unicode when storing text input server-side
- Do not convert shortcodes in JS anymore

Gemfile.lock

@@ -106,9 +106,9 @@ GEM
       rack (>= 1.0.0)
       rack-test (>= 0.5.4)
       xpath (~> 2.0)
-    charlock_holmes (0.7.3)
     case_transform (0.2)
       activesupport
+    charlock_holmes (0.7.3)
     chunky_png (1.3.8)
     cld3 (3.1.3)
       ffi (>= 1.1.0, < 1.10.0)
@@ -163,6 +163,7 @@ GEM
     fuubar (2.2.0)
       rspec-core (~> 3.0)
       ruby-progressbar (~> 1.4)
+    gemoji (3.0.0)
     globalid (0.4.0)
       activesupport (>= 4.2.0)
     goldfinger (1.2.0)
@@ -518,6 +519,7 @@ DEPENDENCIES
   faker (~> 1.7)
   fast_blank (~> 1.0)
   fuubar (~> 2.2)
+  gemoji (~> 3.0)
   goldfinger (~> 1.2)
   hamlit-rails (~> 0.2)
   hiredis (~> 0.6)