Release 2015.8

There are some important bugfixes in this release for users who do
multiple `ostree_repo_pull()` inside a single process lifetime, which
is necessary for use by daemons.

Yet more fixes continue to land for static deltas.  I'm still not
ready to declare them stable - it's clearly a case of the last 20%
being 80% of the work.  Something that's on my radar again is bsdiff;
see https://lists.clearlinux.org/pipermail/dev/2015-August/000038.html

Beyond that there is some neat new work on a command line (and API)
for inspecting remote repositories without downloading the content.
For OS vendors which provide multiple branches, this should be quite
useful.

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