Remove Guava now its in the core

Change-Id: Id1fe8b120f62dcb4329b5816cee230161eaf0496
Reviewed-on: http://gerrit.dmdirc.com/3305
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>

ivy.xml

         <dependency org="org.slf4j" name="slf4j-api" rev="1.+" conf="main->default" />
 
         <!-- Main - ui_swing -->
-        <dependency org="com.google.guava" name="guava" rev="15.+" conf="build->default" />
         <dependency org="com.dmdirc" name="annotations" rev="[0.6,)" conf="main->default" />
         <dependency org="com.miglayout" name="miglayout-swing" rev="4.+" conf="main->default" />
         <dependency org="org.swinglabs" name="jxlayer" rev="3.+" conf="main->default" />