Fix up missing link tags in some XML files. (#15)

Signed-off-by: Chris Lalancette <clalancette@openrobotics.org>

kdl_parser/test/pr2_desc_bracket.xml

@@ -8,7 +8,7 @@
       <calibration reference_position="0.0" values="1.5 -1"/>
       <joint_properties damping="0.0" friction="0.0"/>
     </joint>
-  
+
     <link name="fl_caster_rotation_link">
       <parent name="base_link"/>
       <joint name="fl_caster_rotation_joint"/>
@@ -18,4 +18,5 @@
         <com xyz="0 0 0.07"/>
         <inertia ixx="0.012411765597" ixy="-0.000711733678" ixz="0.00050272983" iyy="0.015218160428" iyz="-0.000004273467" izz="0.011763977943"/>
       </inertial>
+    </link>
 </robot>

kdl_parser/test/pr2_desc_bracket2.xml

@@ -8,7 +8,7 @@
       <calibration reference_position="0.0" values="1.5 -1"/>
       <joint_properties damping="0.0" friction="0.0"/>
     </joint>
-  
+
     <link name="fl_caster_rotation_link">
       <parent name="base_link"/>
       <joint name="fl_caster_rotation_joint"/>
@@ -18,4 +18,5 @@
         <com xyz="0 0 0.07"/>
         <inertia ixx="0.012411765597" ixy="-0.000711733678" ixz="0.00050272983" iyy="0.015218160428" iyz="-0.000004273467" izz="0.011763977943"/>
       </inertial>
+    </link>
 </robot>

kdl_parser/test/pr2_desc_vector.xml

@@ -8,7 +8,7 @@
       <calibration reference_position="0.0" values="1.5 -1"/>
       <joint_properties damping="0.0" friction="0.0"/>
     </joint>
-  
+
     <link name="fl_caster_rotation_link">
       <parent name="base_link"/>
       <origin rpy="0 0 1 9" xyz="0.2225 0.2225 0.0282"/>
@@ -19,4 +19,5 @@
         <com xyz="0 0 0.07"/>
         <inertia ixx="0.012411765597" ixy="-0.000711733678" ixz="0.00050272983" iyy="0.015218160428" iyz="-0.000004273467" izz="0.011763977943"/>
       </inertial>
+    </link>
 </robot>