bumped version to 1.5.1, updated NEWS

NEWS

 Knot DNS NEWS
+
+1.5.1 - Aug 19, 2014
+-----------------------
+Features:
+	* Basic support for logging using systemd journal
+	* DDNS: Ability to process updates in bulk
+
+Improvements:
+	* Unified logging messages structure
+	* DNSSEC: More strict controls for signing keys
+
+Bugfixes:
+	* DNSSEC: DNAMEs in RDATA were not lowercased before signing
+	* EDNS: OPT RR were not put into responsing for some errors
+	* TSIG: DDNS responses were not signed with TSIG
+	* DDNS: Prerequisite checks failed for some inputs
+	* knsupdate: Zone origin was not used for deletions
+	
 1.5.0 - Jul 8, 2014
 -----------------------
 Features:

configure.ac

 #                                               -*- Autoconf -*-
 
 AC_PREREQ([2.60])
-AC_INIT([knot], [1.5.0], [knot-dns@labs.nic.cz])
+AC_INIT([knot], [1.5.1], [knot-dns@labs.nic.cz])
 AM_INIT_AUTOMAKE([gnits subdir-objects dist-xz -Wall -Werror])
 AM_SILENT_RULES([yes])
 AC_CONFIG_SRCDIR([src/knot/main.c])