Release Snappy 1.1.3; getting the new Uncompress variant in a release is nice,

and it's also good to finally get an official release out after the migration
to GitHub.

The GitHub releases are basically done by tagging a commit and then uploading
the .tar.gz file generated by make dist as a binary asset; GitHub will add
all files on the tagged commit on top of the tarball and recompress, but since
we don't have any nodist_* files in configure.ac, this works fine for us.
(As far as I can see, this behavior of GitHub--uncompressing the .tar.gz,
and the behavior of silently ignoring files in it that are also in the git
repository--is undocumented, but also seems to be used in some official
screenshots, so I guess we can rely on it.)

A=sesse
R=jeff

configure.ac

@@ -1,11 +1,11 @@
 m4_define([snappy_major], [1])
 m4_define([snappy_minor], [1])
-m4_define([snappy_patchlevel], [2])
+m4_define([snappy_patchlevel], [3])
 
 # Libtool shared library interface versions (current:revision:age)
 # Update this value for every release!  (A:B:C will map to foo.so.(A-C).C.B)
 # http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
-m4_define([snappy_ltversion], [3:1:2])
+m4_define([snappy_ltversion], [4:0:3])
 
 AC_INIT([snappy], [snappy_major.snappy_minor.snappy_patchlevel])
 AC_CONFIG_MACRO_DIR([m4])