Updated Forge compilation to ForgeGradle.

COMPILING.md

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+Compiling
+=========
+
+You can (most easily) compile WorldEdit using one of the build scripts.
+
+* **Maven** is for compiling **API**, **Bukkit**, and **Spout** versions
+* **Gradle** is for the **Forge** version
+
+The Java Development Kit is required.
+
+* [Get JDK 7 and 8](http://www.oracle.com/technetwork/java/javase/downloads/index-jsp-138363.html)
+* [Get JDK 6](http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase6-419409.html)
+
+WorldEdit is written and targetted for Java 6, though you can use newer
+versions (with warnings). If you plan on compiling for Forge, you **need**
+at least Java 7 to be your "default" Java. (You can install several versions
+of the JDK.)
+
+Dependencies
+------------
+
+Both build scripts will download dependencies automatically. If, for some
+reason, compilation fails due to a missing dependency, please notify us.
+
+Folder Structure
+----------------
+
+Two source directories are required for compilation:
+
+* The main source files are *src/main/java*
+* Files marked for deprecation and future removal are in *src/legacy/java*
+
+Otheriwse, files for each platform are available in different folders:
+
+* The Bukkit implementation is located in *src/bukkit/java*
+* The Spout implementation is located in *src/spout/java*
+* The Forge implementation is located in *src/forge/java*
+
+Maven
+-----
+
+**Don't have Maven?** [Download Maven](http://maven.apache.org/download.cgi)
+from the Maven website.
+
+From WorldEdit's directory, execute the following command to compile a
+Bukkit version:
+
+    mvn clean package
+
+Once done, the *target/* folder will contain a .jar file and release .zip
+files.
+
+### Other Variations
+
+* `mvn clean package -P !bukkit` for just the API
+* `mvn clean package -P !bukkit -Pspout` for the Spout version
+
+Gradle
+------
+
+**Note:** As mentioned previously, you need Java 7 (a recent version) to
+execute the following steps successfully. Your `JAVA_HOME` environment
+variable needs to be set to the path of JDK 7+.
+
+**Don't have Gradle?** Replace `gradle` with `gradlew` below, which will
+automatically download a copy of Gradle for you.
+
+From WorldEdit's directory, clean the cache first with the following
+command:
+
+    gradle cleancache --refresh-dependencies
+    
+Build WorldEdit for Forge with:
+
+    gradle build
+
+Once complete, you will find the release .jar in the folder *build/libs*.
+
+### Other Tasks
+
+* `gradle setupDecompWorkspace idea` will generate an [IntelliJ IDEA](http://www.jetbrains.com/idea/) workspace
+* `gradle setupDecompWorkspace eclipse` will generate an [https://www.eclipse.org/downloads/](Eclipse) workspace