Added manual style checking script.

tools/checkstyle.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+
+[ -f $1 ] || $(echo "File $1 does not exists." && exit 1)
+
+bad=0
+
+if [ `wc -L $1 | awk '{ print $1 }'` -gt 80 ]; then
+  echo "File \"$1\" has lines with more than 80 columns."
+  bad=1
+fi
+
+grep -P '\t' $1 > /dev/null
+if [ $? -eq 0 ]; then
+  echo "File \"$1\" has tabulations in it."
+  bad=1
+fi
+
+grep -P ' +$' $1 > /dev/null
+if [ $? -eq 0 ]; then
+  echo "File \"$1\" has trailing whitespace."
+  bad=1
+fi
+
+exit $bad