[eclipse/eclipse-luna] (5 commits) ...Fix icon cache update errors

[Mat Booth]

Summary of changes:

  07c056f... Backport fix for eclipse bz438992 (*)
  322be2b... Add appstream addon metadata for JDT and PDE plugins (*)
  e9d4fa1... Update eclipse-build snapshot (*)
  f0edd6d... Merge branch 'f21' into eclipse-luna
  363d476... Fix icon cache update errors

(*) This commit already existed in another branch; no separate mail sent