Add bin/server to invoke server using configure'd node

* .gitignore (bin/server): Ignore generated file.
* bin/server.in: Add script.
* configure.ac: (NODE): Correct description (capitalize `Node').
  (NODE_FLAGS): Add arg var.
  (NODE_DESTRUCTURE): Use determined node path for test.
  (AUTOGENERATED): Add substitution.
  (AC_CONFIG_FILES): Add bin/server.  Make it executable.

.gitignore

@@ -7,6 +7,7 @@ configure
 Makefile.in
 
 # generated by configure
+bin/server
 src/version.js
 /config.*
 Makefile

bin/server.in

@@ -0,0 +1,32 @@
+#!/bin/sh
+# Start Liza Server using Node.js executable determined at configure-time
+#
+#  Copyright (C) 2017 R-T Specialty, LLC.
+#
+#  This file is part of liza.
+#
+#  This program is free software: you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation, either version 3 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# In addition to the configure-time NODE_FLAGS, the NODE_FLAGS environment
+# variable can be used to add additional arguments to this script.
+# WARNING: NODE_FLAGS arguments provided via environment varialbes are _not_
+# escaped, so be mindful of word expansion!
+#
+# @AUTOGENERATED@
+##
+
+cd "$( dirname $( readlink -f "$0" ) )"
+
+"@NODE@" @NODE_FLAGS@ $NODE_FLAGS server.js "$@"
+

configure.ac

@@ -32,7 +32,8 @@ AC_SUBST(MINOR, m4_argn(2, ver_split))
 AC_SUBST(REV, m4_argn(3, ver_split))
 AC_SUBST(SUFFIX, m4_argn(4, ver_split))
 
-AC_ARG_VAR([NODE], [The node.js interpreter])
+AC_ARG_VAR([NODE], [The Node.js interpreter])
+AC_ARG_VAR([NODE_FLAGS], [Arguments to Node.js for Liza Server (bin/server)])
 AC_CHECK_PROGS(NODE, [node nodejs])
 
 test -n "$NODE" || AC_MSG_ERROR([missing Node.js])
@@ -43,12 +44,15 @@ AC_CHECK_PROGS(TWOPI, [twopi])
 AM_CONDITIONAL(HAS_TWOPI, [test "$TWOPI"])
 
 # only needed for older versions of Node
-AC_MSG_CHECKING([node --harmony_destructuring])
-AS_IF([node --harmony_destructuring >/dev/null 2>/dev/null],
+AC_MSG_CHECKING([$NODE --harmony_destructuring])
+AS_IF(["$NODE" --harmony_destructuring >/dev/null 2>/dev/null],
       [AC_MSG_RESULT(available)
        AC_SUBST([NODE_DESTRUCTURE], [--harmony_destructuring])],
       [AC_MSG_RESULT(no)])
 
+# include above check(s) in NODE_FLAGS
+NODE_FLAGS="$NODE_FLAGS $NODE_DESTRUCTURE"
+
 set_devnotes='@set DEVNOTES'
 AC_ARG_ENABLE(
   [devnotes],
@@ -68,8 +72,13 @@ AC_ARG_WITH(
 
 AC_SUBST([SET_SRCURI], [$set_srcuri])
 
+AC_SUBST([AUTOGENERATED],
+         ["THIS FILE IS AUTOGENERATED!  DO NOT MODIFY!  See *.in."])
+
 # generate files from their *.in counterparts
 AC_CONFIG_FILES([Makefile package.json
                  doc/Makefile doc/config.texi
-                 src/version.js])
+                 src/version.js
+                 bin/server],
+                [chmod +x bin/server])
 AC_OUTPUT