Fix a typo in ECKey JavaDocs.

Remove the timestamp from the generated JavaDoc output to minimize subversion diffs in future.
Make the broadcastTransaction method of Peer package private. It's no longer needed to send coins.

build.xml

@@ -17,7 +17,8 @@
   <target name="docs" depends="init">
     <javadoc sourcepath="src" 
              excludepackagenames="com.google.bitcoin.bouncycastle.*"
-             destdir="docs"/>
+             destdir="docs"
+             additionalparam="-notimestamp"/>
   </target>
 
   <target name="test" depends="compile">