Added builtin diff syntax into git commit messages

Updated README with installation instructions and better markdown highlighting

Author: adambullmer

README.md

@@ -2,6 +2,19 @@
 
 Syntax Highlighting for SublimeText / Text Mate
 
+## Installation
+
+### With Package Control:
+
+1. Run the `Package Control: Install Package` command, find and install the Git Commit Message Syntax plugin.
+1. Restart Sublime Text (if required)
+
+### Manually:
+
+1. Clone or download the git repo into your packages folder (in Sublime Text, find Browse Packages… menu item to open this folder)
+1. Restart Sublime Text editor (if required)
+
+
 ## How to make commits with Sublime Text
 For the following options, you'll need to use the appropriate command from below:
 **Note** for Windows, you must have `Build 3065` or lated to have command line support
@@ -14,19 +27,19 @@ This will allow for more editing options than just the git commit, like editing
 Add the following to your `.bashrc`:
 On Mac and Linux:
 
-```
+```bash
 export EDITOR="subl -w"
 ```
 
 ### Alternate Method: Ammend your `.gitconfig`
 You can run the following command to let git update your `.gitconfig`
 
-```
+```bash
 git config --global core.editor 'subl -w'
 ```
 
 Or add the following line manually to your `.gitconfig`
-```
+```ini
 [core]
     editor = 'subl -w'
 ```

commit-message.JSON-tmLanguage

@@ -74,5 +74,8 @@
                 }
             }]
         }]
+    },
+    {
+        "include": "source.diff"
     }]
 }

commit-message.tmLanguage

@@ -171,6 +171,10 @@
 				</dict>
 			</array>
 		</dict>
+		<dict>
+			<key>include</key>
+			<string>source.diff</string>
+		</dict>
 	</array>
 	<key>scopeName</key>
 	<string>text.git-commit-message</string>