Start on a gerrit plugin as a sub-plugin of git.

- Add a gerrit window that shows a list of changes
  and buttons to display, apply or check out
  a change.
- Uses the new Qt 5 Json API or the utils/json
  classes for Qt 4.

Tested-by: Tobias Hunger <tobias.hunger@nokia.com>
Tested-by: Orgad Shaneh <orgads@gmail.com>

Change-Id: I14c6c2c2de8f95fb785752c7319be8638b386a1e
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

src/plugins/coreplugin/vcsmanager.h

@@ -68,6 +68,9 @@ public:
     void resetVersionControlForDirectory(const QString &inputDirectory);
     IVersionControl *findVersionControlForDirectory(const QString &directory,
                                                     QString *topLevelDirectory = 0);
+
+    QStringList repositories(const IVersionControl *) const;
+
     IVersionControl *checkout(const QString &versionControlType,
                               const QString &directory,
                               const QByteArray &url);