Update README

.travis.yml

+language: java
+
+jdk:
+  - oraclejdk8

README.md

 # RagDoc Builder
 
-This is a tool for building documentation metadata about JastAdd applications.
+This is a tool for building documentation metadata for JastAdd projects.
+RD-Builder outputs JSON files with documentation metadata.  The documentation
+can be viewed with RagDoc Viewer.
 
 
-Run RD-Builder on the generated Java code of your JastAdd project as if
-compiling the code. RD-Builder outputs a bunch of JSON files describing the
-structure of the input classes. The generated documentation can be viewed with
-RagDoc Viewer.
-
-RagDoll depends on the following projects:
-
-* `extendj`
-* `se.llbit:jo-json`
-
 ## Building
 
 Build the tool with Gradle:
@@ -23,8 +15,8 @@ Build the tool with Gradle:
 
 ## Usage
 
-Run RagDoc Builder just like a regular Java compiler. The output is written to
-the path specified by the `-d` option:
+Run RagDoc Builder on the generated JastAdd code, just like a regular Java compiler.
+The output is written to the path specified by the `-d` option:
 
     java -jar rd-builder.jar -d docs -classpath $CLASSPATH File1.java ...
 
@@ -32,3 +24,7 @@ the path specified by the `-d` option:
 The documentation is generated as a set of `.json` files containing information about
 the classes and attributes in the input sources. This information can be viewed on
 a webpage using RagDoc Viewer.
+
+RagDoc Builder can also be run using JastAddGradle. By running RagDoc Builder
+this way, you won't have to set up the full compile path because JastAddGradle
+knows how to compile the generated JastAdd code.