Update jRuby to 1.7.1

Need to force runtime into 1.8 mode as Compass has some incompatibilties
with jRuby under 1.9 mode.
Sass gem updated as well as the hash was changed anyway but updating the
property file

build/build-tasks.properties

@@ -12,12 +12,12 @@ antcontribs.jar=${lib.dir}/ant-contrib-1.0b3.jar
 cssurlembed.jar=${lib.dir}/cssembed-0.4.5.jar
 
 #jRuby Properties
-jruby.version=1.6.8
+jruby.version=1.7.1
 jruby.jar=jruby-complete-${jruby.version}.jar
 
 #Gems
 gem.dir=${lib.dir}/jruby-compiled
-sass.gem=sass-3.2.1.gem
+sass.gem=sass-3.2.3.gem
 chunky_png.gem=chunky_png-1.2.6.gem
 fssm.gem=fssm-0.2.9.gem
 compass.gem=compass-0.12.2.gem

build/build-tasks.xml

@@ -89,6 +89,7 @@
 
 	<target name="call.sass">
 		<java fork="true" failonerror="true" jar="${lib.dir}/${jruby.jar}">
+			<arg value="--1.8"/>
 			<arg path="${tasks.basedir}/compile.rb"/>
 			<arg path="${lib.dir}/vendors-${jruby.depends}/gems/"/>
 			<arg value="${command}"/>