Introduce 'kotlin' script for running programs

'kotlin' is to 'kotlinc' what 'java' is to 'javac'. However it will support
much more: running class by name, jar, scripts, expressions, REPL

compiler/cli/bin/kotlin.bat

@@ -0,0 +1,20 @@
+@echo off
+
+rem Copyright 2010-2015 JetBrains s.r.o.
+rem
+rem Licensed under the Apache License, Version 2.0 (the "License");
+rem you may not use this file except in compliance with the License.
+rem You may obtain a copy of the License at
+rem
+rem http://www.apache.org/licenses/LICENSE-2.0
+rem
+rem Unless required by applicable law or agreed to in writing, software
+rem distributed under the License is distributed on an "AS IS" BASIS,
+rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+rem See the License for the specific language governing permissions and
+rem limitations under the License.
+
+setlocal
+set _KOTLIN_RUNNER=1
+
+call %~dps0kotlinc.bat %*