Updated elixr and fixed table th element borders

Fixes #164.

@@ -12,7 +12,7 @@
     "babel-runtime": "^5.8.29",
     "bootstrap-sass": "^3.0.0",
     "dropzone": "^4.0.1",
-    "laravel-elixir": "^3.4.0",
+    "laravel-elixir": "^5.0.0",
     "marked": "^0.3.5",
     "moment": "^2.12.0",
     "zeroclipboard": "^2.2.0"

@@ -23,7 +23,7 @@ button {
 
 table {
   min-width: 100px;
-  td {
+  td, th {
 	min-width: 10px;
 	padding: 4px 6px;
 	border: 1px solid #DDD;