Log Message:
Add duktape 1.5.1, an MIT-licensed Javascript engine.

This is the command-line tool, which uses the recently added libduktape package.

	Duktape is an embeddable Ecmascript E5/E5.1 engine with a focus on
	portability and compact footprint.  By integrating Duktape into your
	C/C++ program you can easily extend its functionality through
	scripting.  You can also build the main control flow of your program
	in Ecmascript and use fast C code functions to do heavy lifting.

	The terms Ecmascript and Javascript are often considered more or less
	equivalent, although Javascript and its variants are technically just
	one environment where the Ecmascript language is used.  The line
	between the two is not very clear in practice:  even non-browser
	Ecmascript environments often provide some browser-specific built-ins.
	Duktape is no exception, and provides the commonly used print() and
	alert() built-ins.  Even so, we use the term Ecmascript throughout to
	refer to the language implemented by Duktape.