Upgrade to signed Pdf4Eclipse build to reduce set of unsiged bundles

shown in warning dialog during p2 upgrade.

[Build][Toolbox]

org.lamport.tla.toolbox.product.product/TLAToolbox.target

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<?pde version="3.8"?><target name="TLA+ Toolbox" sequenceNumber="73">
+<?pde version="3.8"?><target name="TLA+ Toolbox" sequenceNumber="74">
 <locations>
 <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="planner" includeSource="true" type="InstallableUnit">
 <unit id="org.eclipse.contribution.weaving.feature.group" version="2.2.4.e45x-20150206-1600"/>
@@ -48,7 +48,7 @@
 <repository location="http://download.eclipse.org/eclipse/updates/4.5/" id="eclipse"/>
 </location>
 <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="planner" includeSource="true" type="InstallableUnit">
-<unit id="de.vonloesch.pdf4eclipse.feature.feature.group" version="1.1.0.201604081945"/>
+<unit id="de.vonloesch.pdf4eclipse.feature.feature.group" version="1.1.0.201704071204"/>
 <repository location="http://lemmy.github.com/Pdf4Eclipse/"/>
 </location>
 <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="planner" includeSource="true" type="InstallableUnit">