bump Configurations

mostly to get dSYMs

 Submodule changes to be committed:

 * Configuration 6186be7...f54fa27 (3):
   > Merge pull request #12
   > Merge pull request #11 from jspahrsummers/project-headers-first
   > Merge pull request #10 from jspahrsummers/no-warn-weak
Add class method to check for valid reference names.
Implement objectByPeelingTagError: to peel a tag object.
Add objectByPeelingToType:error: to GTObject using git_object_peel.
Make `-[NSError git_errorFor:withAdditionalDescription:]` a vararg method.
Merge branch 'rename-sha-oid' into HEAD
Incorrect return type.
Use the new vararg method to give additional information in error messages.
Same line-ing.
Build a more Cocoa-like error

with the libgit2 error set as underlying the newly-created one.
Merge branch 'master' into vararg-error
Use the vararg.
Protect against nil libgit2 errors.
Style.
Merge pull request #218 from tiennou/vararg-error

Make `-[NSError git_errorFor:withAdditionalDescription:]` a vararg method.
libgit2 errors are int-sized.
Merge pull request #226 from libgit2/int-errors

libgit2 errors are int-sized.
Change return type to id
Change < to !=
Change return type to id.