Change EditableRevision and CompareWithIndexAction to EPL
These two files were contributed after the license change to EPL
and thus should have been created with an EPL header, and not a
BSD style header from JGit.
Yann has already agreed that his contributions are under the EPL,
for more details see the private message between myself and him
with Message-ID: <551f769b0906250204h27cd3ec3l47d8e66327aa18ab@mail.gmail.com>
A copy of this message was filed with the Eclipse Foundation as part
of IPzilla CQ 3393 to help meet the IP due diligence requirements
for the initial contribution of EGit.
CC: Yann Simon <yann.simon.fr@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>