548295: update org.eclipse.mylyn versions to 3.26

Change-Id: I07fded3c9ae094858b1339899a0dfe049ec3fd95
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=548295 (+1 squashed commit)
Signed-off-by: Colin Ritchie <colin.ritchie@tasktop.com>
9 files changed