SLING-3769 : renamed import/export to pull/push to put the emphasis on the target (ie the server) rather than the source (ie eclipse)

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1611353 13f79535-47bb-0310-9956-ffa450edef68
SLING-3764 - Incorrect resource processing order - directory artifact
processed before primary artifact

- make sorting child nodes a separate command/step when processing
updates. This ensures that that the sorting is done at the end, when all
potential child node changes have been processed
- ensure that the resources returned from the SlingContentModuleFactory
are returned in a consistent order which allows us to process them in a
natural order form a vault serialization point of view

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1611371 13f79535-47bb-0310-9956-ffa450edef68