add AUTHORS file to identify contributors to wkhtmltopdf

This was generated by running the following command:
  git log --format='%aN <%aE>' | awk '{arr[$0]++} END{for (i in arr){print arr[i], i;}}' | sort -rn
and hand-editing the output to remove duplicates

AUTHORS

@@ -0,0 +1,30 @@
+
+Jakob Truelsen      <antialize@gmail.com>
+Jan Habermann       <jan@habermann24.com>
+Ashish Kulkarni     <kulkarni.ashish@gmail.com>
+Pablo Ruiz García   <pablo.ruiz@gmail.com>
+Trevor North        <trevor@blubolt.com>
+pussbb              <pussbb@gmail.com>
+Kasper F. Brandt    <poizan@poizan.dk>
+peterrehm           <peter.rehm@renvest.de>
+Ruslan Grabovoy     <kudgo.test@gmail.com>
+Renan Gonçalves     <renan.saddam@gmail.com>
+Douglas Bagnall     <douglas@paradise.net.nz>
+Christian Sciberras <uuf6429@gmail.com>
+Aaron Stone         <aaron@serendipity.cx>
+Костадин Дамянов    <maxmight@gmail.com>
+rainabba            <michael@RAINABBA4.compteknet.local>
+Todd Fisher         <todd.fisher@gmail.com>
+Tobin Juday         <tobinibot@gmail.com>
+Sven Nierlein       <sven@nierlein.org>
+Steve Shreeve       <steve.shreeve@gmail.com>
+Sem                 <spam@esemi.ru>
+Pankaj Jangid       <pankaj.jangid@gmail.com>
+Oleg Kostyuk        <cub.uanic@gmail.com>
+Nolan Neustaeter    <github@noolan.ca>
+Matthieu Bontemps   <matthieu.bontemps@gmail.com>
+Kurt Revis          <krevis@snoize.com>
+Erling Linde        <erlingwl@gmail.com>
+Bill Kuker          <bkuker@billkuker.com>
+Benoit Garret       <benoit.garret@gmail.com>
+Adam Thorsen        <adam.thorsen@gmail.com>