title: Tycho downloads dependency but fails to resolve it
body: <p>I have an odd problem with Tycho 0.15.0. There are 8 dependencies in my <code>MANIFEST.MF</code> but Tycho fails to resolve one of them. The output looks like this:</p>
  
  <pre><code>[INFO] 1 operation remaining.
  [INFO] Fetching org.eclipse.xtext.logging_1.2.15.v201206120633.jar (4kB of 10.12kB at 0B/s) from http://my.server.com/p2-3.7.2/plugins/
  [INFO] Resolving class path of MavenProject: &lt;...my project ...&gt; @ &lt;...path to my project...&gt;/pom.xml
  [ERROR] Internal error: java.lang.RuntimeException: org.osgi.framework.BundleException: Bundle &lt;...my project...&gt; cannot be resolved
  [ERROR] Resolution errors:
  [ERROR] Bundle &lt;...my project...&gt; - Missing Constraint: Require-Bundle: org.eclipse.xtext.logging; bundle-version="1.2.15"
  [ERROR] -&gt; [Help 1]
  org.apache.maven.InternalErrorException: Internal error: java.lang.RuntimeException: org.osgi.framework.BundleException: Bundle &lt;...my project...&gt; cannot be resolved
  Resolution errors:
  Bundle &lt;...my project...&gt; - Missing Constraint: Require-Bundle: org.eclipse.xtext.logging; bundle-version="1.2.15"
  </code></pre>
  
  <p>What I know:</p>
  
  <ol>
  <li>The jar <code>org.eclipse.xtext.logging_1.2.15.v201206120633.jar</code> exists</li>
  <li>The jar isn't corrupt</li>
  <li>Tycho can download it from my p2 server (I have <code>~/.m2/repository/p2/osgi/bundle/org.eclipse.xtext.logging/1.2.15.v201206120633/org.eclipse.xtext.logging-1.2.15.v201206120633.jar</code> on my computer)</li>
  <li><p>The <code>MANIFEST.MF</code> looks correct:</p>
  
  <pre><code>Manifest-Version: 1.0
  Ant-Version: Apache Ant 1.8.2
  Bundle-Vendor: %providerName
  Bundle-Localization: fragment
  Fragment-Host: org.apache.log4j;bundle-version="[1.2.15,1.2.16)"
  Bundle-RequiredExecutionEnvironment: J2SE-1.5
  Bundle-Name: %pluginName
  Bundle-SymbolicName: org.eclipse.xtext.logging;singleton:=true
  Created-By: 1.5.0_22-b03 (Sun Microsystems Inc.)
  Bundle-Version: 1.2.15.v201206120633
  Bundle-ManifestVersion: 2
  Import-Package: org.eclipse.core.runtime,org.osgi.framework;version="1
  .5.0"
  </code></pre></li>
  <li><p>Tycho 0.16.0 has the same problem.</p></li>
  </ol>
  
  <p>Any ideas?</p>