Added ability for call tag to use container as input stream.

tests/testcall.jet

@@ -1,11 +1,18 @@
 #!../jet-2.0
-<jet name1="localname" filterblanklines="true" trimlines="true">
+<jet name1="localname" filterblanklines="false" trimlines="true">
 <set name="abc" value="abcdefg" />
 <call pgm="cat" error="error" input="$[abc]xyz" name="test1" />
 test1=$[test1]
 name1=$[%name1]
 error=$[error]
-<call error="rc" pgm="/usr/bin/ls" arg1="-al" />
+<call error="rc" pgm="ls" arg1="-al" />
 $[rc]
+<call pgm="cat" filterblanklines="false">
+From: barant@barant.com
+To: brad.arant@gmail.com
+Subject: This is a test email.
 
+This is a test email being sent from a jet script with a single 
+call command.
+</call>
 </jet>