ar-track-alvar: updating to 0.5.1

This commit also drops the patch provided upstream, and since
version 0.5.1, the ar_track_alvar package now provides an archive
with more default directory structure.

This commit also corrects the license information in the recipe to
LGPL-2.1.

recipes-ros/ar-track-alvar/ar-track-alvar_0.4.2.bb → recipes-ros/ar-track-alvar/ar-track-alvar_0.5.1.bb

 DESCRIPTION = "This package is a ROS wrapper for Alvar, an open source AR tag tracking library."
 SECTION = "devel"
-LICENSE = "BSD"
+LICENSE = "LGPL-2.1"
 LIC_FILES_CHKSUM = "file://package.xml;beginline=8;endline=8;md5=f62de161dc7a8f859a0502707b17209e"
 
-DEPENDS = "cmake-modules cv-bridge image-transport libtinyxml pcl-ros resource-retriever roscpp tf visualization-msgs"
+DEPENDS = "ar-track-alvar-msgs cmake-modules cv-bridge image-transport libtinyxml pcl-ros resource-retriever roscpp tf visualization-msgs"
 
-SRC_URI = "git://github.com/sniekum/${ROS_SPN}.git;protocol=https;branch=hydro-devel"
-# commit df56a7429 is intended to be version 0.4.2
-SRCREV = "df56a742976712a1de7212039de8056c93b39375"
+SRC_URI = "https://github.com/sniekum/${ROS_SPN}/archive/${PV}.tar.gz;downloadfilename=${ROS_SP}.tar.gz"
+SRC_URI[md5sum] = "5d55aaf9098c1b803f9ed93e3c5fbacd"
+SRC_URI[sha256sum] = "b8c1c28afaf16c03f37067ae2653f5df7d0a15fdb75a27c0a2f4da9c2f89d92e"
 
-S = "${WORKDIR}/git"
+S = "${WORKDIR}/${ROS_SP}"
 
 inherit catkin