Update Potlatch 2 to 2.3-78-g5634629 build

public/potlatch2/imagery.xml

@@ -108,6 +108,14 @@
 		<url>http://cube.telascience.org/tilecache/tilecache.py/1.0.0/NAIP_ALL/$z/$x/$y.png</url>
 		<sourcetag>NAIP</sourcetag>
 	</set>
+	<set minlat='51.32' minlon='-10.71' maxlat='55.46' maxlon='-5.37'>
+		<name>Ireland - NLS Historic Maps</name>
+		<scheme>tms</scheme>
+		<sourcetag>NLS Historic Maps</sourcetag>
+		<url>http://geo.nls.uk/maps/ireland/gsgs4136/$z/$x/$y.png</url>
+		<logo>icons/logo_nls70-nq8.png</logo>
+		<logo_url>http://geo.nls.uk/maps/</logo_url>
+	</set>
 	<set minlat="54.44" minlon="7.81" maxlat="57.86" maxlon="15.49">
 		<name>Denmark - Fugro Aerial Imagery</name>
 		<url>http://tile.openstreetmap.dk/fugro2005/$z/$x/$y.jpg</url>