Removed autogenerated gnulib files.

Leaving these files in the git-repo will break subdir builds, i.e.
the new files will be located in $subdir/gnulib, but the files in
$top_srcdir/gnulib will be used.
Updated AUTHORS file (added email).
Added files generated by gnulib to .gitignore.
Merge pull request #10 from IndexBraille/feature/fix-gnulib-subdir-build

Removed autogenerated gnulib files.