Added a paragraph about building pull requests to README.md.

README.md

@@ -5,6 +5,7 @@ WorldEdit is a voxel and block manipulation library for Minecraft. It is
 primarily a library but bindings to Bukkit (included) and SPC (external)
 are available.
 
+
 Compiling
 ---------
 
@@ -16,12 +17,33 @@ simply run:
 Maven will automatically download dependencies for you. Note: For that to work,
 be sure to add Maven to your "PATH".
 
+
+Compiling branches from pull requests
+-------------------------------------
+WARNING: This is not recommended if you dont understand the changes and/or
+         trust the sender of the pull request!
+
+You need to have Maven and Git installed.
+
+Run the following commands:
+
+    git clone -b <branch> git://github.com/<author>/worldedit.git <directory>
+    cd <directory>
+    mvn clean package
+
+The <directory> is just a directory name you can pick at your leisure
+The other placeholders should be filled in from the pull request's headline:
+
+    <author> wants someone to merge 1 commit into sk89q:master from <author>:<branch> 
+
+
 Issue Tracker
 -------------
 
 Please submit bug reports and feature requests here:
 http://redmine.sk89q.com/projects/worldedit/issues
 
+
 Contributing
 ------------