[EGIT PATCH] Select all changes in repository for commit by default

This is an old patch series, previously send under the subject [EGIT RFC] Commit behaviour
now squash and it seems to work with Eclipse 3.4 too.

This tentative feature allows me to hit the commit button
when any resource is selected and figure out which resources have been
modified. This makes it much easier to commit. Only the toolbar commit
is affected for now.

-- robin