add changelog and github release tools

changelog_parser.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+function parse() {
+    version=$1
+
+    while IFS= read -r line && [ -z "`echo $line | grep -e "^#\+ $version"`" ]
+    do
+        : # do nothing
+    done
+
+    while IFS= read -r line && [ -z "`echo $line | grep -e "^#\+"`" ]
+    do
+        echo "$line"
+    done
+}
+
+version=$1
+file=$2
+
+if [ -n "$file" ]; then
+  parse $version < "$file"
+else
+  parse $version
+fi