add bitcoin address (fix #101)

src/main/resources/i18n/en.properties

@@ -93,6 +93,7 @@ about.line1_suffix=.
 about.line2_prefix=If you encounter an issue, please report it on the issues page of the 
 about.line2_suffix=\ project.
 about.line3=If you like this project, please consider a donation to support the developer and help cover the costs of keeping this website online.
+about.line4=For those of you who prefer bitcoin, here is the address
 about.goodies=Goodies
 about.goodies.subscribe_url=Subscribe URL
 about.goodies.chrome_extension=Chrome extension

src/main/webapp/templates/feeds.help.html

@@ -25,7 +25,8 @@
 				<option value="USD">US Dollars</option>
 			</select>
 		</form>
-
+		${about.line4}
+		<code>1dymfUxqCWpyD7a6rQSqNy4rLVDBsAr5e</code>
 		
 		<h4><i class="icon-puzzle-piece"></i> ${about.goodies}</h4>
 		<p>