When marking commits as uninteresting don't care if the tree exists

When during an ObjectWalk commits are marked as uninteresting we should
be tolerant against the situation that the commit exists in the repo but
the referenced tree is not exisiting. Since commit
c4797fe98655b3d52d0a90ba44fce6e053db3b8b we are throwing
MissingObjectException in such a case. This semantic differs from native
git behaviour and may cause push operations to fail while they would
work in native git. See:
http://dev.eclipse.org/mhonarc/lists/egit-dev/msg03585.html

Bug: 445744
Change-Id: Ib7dec10fd2ef1adbb8adbabb9d3d5a64e554286a
[Java 8] Configure doclint to accept missing descriptions

We avoid trivial descriptions in JavaDoc. Hence configure
doclint to not fail on missing descriptions.

Change-Id: Iba3d5aec18cc7d7f43e53fa6789f0dede9996fb7
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
(cherry picked from commit 54dc4b20b3e084c9c470c8211810dff008b6f0fc)
Generate javadocs as part of Maven site project reports

see http://maven.apache.org/plugins/maven-javadoc-plugin/usage.html

Change-Id: I6dc5dddea0adbb4abf5560d5d1c833408e944082
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
(cherry picked from commit a3d0b0d903452ed9ba9d7bb5ea58c275b318a66f)
Enable maven site generation for jgit

Generating the site:
$ mvn site:site

Local staging of the site:
$ mvn site:stage
the site is staged under ./target/staging/

If you can connect to build.eclipse.org over ssh
(ask webmaster if you are a committer and need ssh access)
you can deploy a local build of the site:
$ mvn site:deploy
The site is deployed under
http://download.eclipse.org/jgit/site/${project.version}

To select the ssh key to use for deploying over ssh add the following
section to your Maven settings.xml:
<server>
  <id>jgit.website</id>
  <username>username</username>
  <privateKey>${user.home}/.ssh/id_rsa</privateKey>
  <filePermissions>664</filePermission>
  <directoryPermissions>775</directoryPermissions>
  <configuration></configuration>
</server>

To deploy the site from Hudson https://hudson.eclipse.org/egit/
enable the Maven profile "build-server".

Change-Id: I7e64c8560ca75196d2232f111ffad953c14f013f
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
(cherry picked from commit 6d00f0a09c67421d4ac9960c568f9c18ceb4a6a4)
Compare API changes against 3.5.0

Change-Id: I10e51aea66f1446dd1d6d367ea113d824252d82b
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Merge branch 'stable-3.5'

* origin/stable-3.5:
  When marking commits as uninteresting don't care if the tree exists

Change-Id: I66559a72ed7284cb721cf929512af884c0db2d61
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>