Change highlighting of variables with underscore (#182)

* Change highlighting of variables with underscore

* use Python 3.4 on Travis

* use xvfb service on Travis

Author: optikfluffel

.travis.yml

@@ -3,23 +3,22 @@ env:
         - PACKAGE="Elixir" # Package name
         - SUBLIME_TEXT_VERSION="3"
 
+services:
+    # enable gui, see https://docs.travis-ci.com/user/gui-and-headless-browsers
+    - xvfb
+
 # mutliple os matrix
 # https://docs.travis-ci.com/user/multi-os/#Python-example-(unsupported-languages)
 matrix:
     include:
         - os: linux
           language: python
-          python: 3.3
+          python: 3.4
         - os: osx
           language: generic
 
 before_install:
     - curl -OL https://raw.githubusercontent.com/SublimeText/UnitTesting/master/sbin/travis.sh
-    # enable gui, see https://docs.travis-ci.com/user/gui-and-headless-browsers
-    - if [ "$TRAVIS_OS_NAME" == "linux"  ]; then
-            export DISPLAY=:99.0;
-            sh -e /etc/init.d/xvfb start;
-      fi
 
 install:
     # bootstrap the testing environment

Syntaxes/Elixir.tmLanguage

@@ -1328,6 +1328,18 @@
 						</dict>
 					</array>
 				</dict>
+				<dict>
+					<key>match</key>
+					<string>\b_([\w]+[?!]?)</string>
+					<key>name</key>
+					<string>comment.unused.elixir</string>
+				</dict>
+				<dict>
+					<key>match</key>
+					<string>\b_\b</string>
+					<key>name</key>
+					<string>comment.wildcard.elixir</string>
+				</dict>
 				<dict>
 					<key>comment</key>
 					<string>