Update AUTHORS
Fix bug popping ignore files during wd iteration

There were a couple bugs in popping ignore files during iteration
that could result in incorrect decisions be made and thus ignore
files below the root either not being loaded correctly or not
being popped at the right time.

One bug was an off-by-one in comparing the path of the gitignore
file with the path being exited during iteration.

The second bug was not correctly truncating the path being tracked
during traversal if there were no ignores on the list (i.e. when
you have no .gitignore at the root, but do have some in contained
directories).
Correct C90 warnings
Merge pull request #2262 from libgit2/rb/fix-ignore-pop

Fix bug popping ignore files during wd iteration
Introduce git_merge__extract_conflict_paths
Added cherry-pick support
Added cherry pick tests
Capture conflict information in MERGE_MSG for revert and merge
Merge pull request #2264 from jacquesg/fix-warnings

Correct C90 warnings
Fix core.excludesfile named .gitignore

Ignore rules with slashes in them are matched using FNM_PATHNAME
and use the path to the .gitignore file from the root of the
repository along with the path fragment (including slashes) in
the ignore file itself.  Unfortunately, the relative path to the
.gitignore file was being applied to the global core.excludesfile
if that was also named ".gitignore".

This fixes that with more precise matching and includes test for
ignore rules with leading slashes (which were the primary example
of this being broken in the real world).

This also backports an improvement to the file context logic from
the threadsafe-iterators branch where we don't rely on mutating
the key of the attribute file name to generate the context path.
Merge pull request #2235 from jacquesg/cherry-pick

Add cherry pick support
Merge pull request #2269 from libgit2/rb/fix-leading-slash-ignores

Fix core.excludesfile named .gitignore