wrote more of the compressor and added some tests

test/compress/debugger.js

@@ -0,0 +1,24 @@
+keep_debugger: {
+    options = {
+        drop_debugger: false
+    };
+    input: {
+        debugger;
+    }
+    expect: {
+        debugger;
+    }
+}
+
+drop_debugger: {
+    options = {
+        drop_debugger: true
+    };
+    input: {
+        debugger;
+        if (foo) debugger;
+    }
+    expect: {
+        if (foo);
+    }
+}