add support for webp; add mimetype in .desktop file

.SRCINFO

@@ -1,9 +1,9 @@
 # Generated by mksrcinfo v8
-# Mon Feb 29 17:11:27 UTC 2016
+# Tue Mar 29 12:48:23 UTC 2016
 pkgbase = aseprite
 	pkgdesc = Create animated sprites and pixel art
 	pkgver = 1.1.3
-	pkgrel = 1
+	pkgrel = 2
 	url = http://www.aseprite.org/
 	arch = x86_64
 	arch = i686
@@ -17,10 +17,11 @@ pkgbase = aseprite
 	depends = libjpeg-turbo
 	depends = tinyxml
 	depends = freetype2
+	depends = libwebp
 	source = git+https://github.com/aseprite/aseprite.git#tag=v1.1.3
 	source = aseprite.desktop
 	sha256sums = SKIP
-	sha256sums = c9e624b9fd095ebb3eec8220a58d4a9422f39d68477bafcc0047d773814ba0aa
+	sha256sums = 4faeb782805e3427eedb04d7485e3e2d4eac6680509515b521a9f64ef5d79490
 
 pkgname = aseprite