Log Message:
Update to 1.318
Update DEPENDS

Upstream changes:
1.318 2016-03-12 BOOK
    [ENHANCEMENTS]
    - Extend version support to all existing version
    - Let Git::Version::Compare handle all version comparison code
    - eg/build-git can now build all Git versions since 1.0.0
    [DOCUMENTATION]
    - Minor documentation updates
    - URL corrections by DOLMEN

1.317 2016-02-13 BOOK
    [ENHANCEMENTS]
    - improved git binary detection in Git::Repository::Command
    - fixed version comparisons for 1.0.0a and 1.0.0b under Perl 5.6
    - test_repository( clone => ... ) now dies with a useful message
      when trying to call it with a broken Git
    - Git::Repository::Util provides utility functions for Git stuff
    - eg/build-git: a utility to build and install any Git version
    [DOCUMENTATION]
    - Tutorial entry: "Ignore the system and global configuration files"
    - spelling fix (RT #110027 by Gregor Herrmann)
    [TEST]
    - fix RT #89086 (reported by Alex Raguero)
    - new test: t/test-all-git.t to run the test suite against a directory
      full of git builds (if available)
    - tested against 513 versions of git (including all RC),
      from 1.0.0 to 2.7.1

1.316 2015-12-02 BOOK
    [ENHANCEMENTS]
    - avoid a warning if the filehandles have already been closed
      (related to System::Command 1.114 'interactive' option)
    [DOCUMENTATION]
    - add examples for `git log` and using callbacks with `$r->run`
      in Git::Repository::Tutorial
    [TESTS]
    - git-2.5.2 test suite compatibility fix (Petr �abata)