New #eval directive available

I posted the new #eval directive last night, along with a couple of unit 
tests for the new functionality.  I'll try to update the Wiki page soon. 

In a nutshell, you can now use Strings containing WMScript, instead of 
Templets or other Macros, with #eval.  E.g.,

[#eval "\$a \$b" using { "a":"Foo", "b":"Bar" }]

would expand to:

[Foo Bar]

If you leave off the "using" clause, the current context will be used, e.g.,

#set $a="Foo"
#set $b="Bar"
[#eval "\$a \$b"]

would give the same result as above.

I also added a simple StringMacro class (in org.webmacro.engine) that 
creates a Macro from a WMScript string.  It is used internally by the 
EvalDirective and may be useful to others.

Keats




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