dist.ini: prune README.pod
xs: update libgit2
Branch.xs: fix for new libgit2
Reference.xs: remove is_packed() since it disappeared from libgit2
Branch.xs: move() does not modify the git ref anymore
10-clone.t: use Git::Raw git repository
Branch.xs: add tracking() method
Changes: update
v0.23

 - Update libgit2 to 3f21a23
   + The Branch -> move() method does not modify the Branch object anymore, as
     per the new underlying libgit2 implementation. An additional lookup is
     needed in order to get the new object (incompatible change)
 - Add Branch -> tracking() method
Changes: add is_packed() removal in v0.23 log
xs: update libgit2 to get HTTP redirects support
Config.xs: fix segfault when a config value is not found (closes #13)
Changes: update
v0.24

 - Update libgit2 to d2a4a54
 - Config -> bool()/int()/str() now return undef when a configuration variable
   is not found, instead of segfaulting (GH#13)
xs: update libgit2
Branch.xs: rename tracking() method to upstream()
Changes: update
xs: update libgit2
MakeMaker.pm: enable SSH support if libssh2 is installed
Remote.xs: update fetchspec() and pushspec() to new API, and rename to add_fetch() and add_push()