Merge from trunk to TILES_2_1_X branch.

TILES-468
Changed the class of the causes.

TILES-469
Checking if a class of the porlet API is present. If not, this problem is trapped and the PortletTilesRequestContextFactory ignored.

git-svn-id: https://svn.apache.org/repos/asf/tiles/framework/branches/TILES_2_1_X@819649 13f79535-47bb-0310-9956-ffa450edef68
5 files changed