Further mnemonic tweaks.

src/main/bash/gvm-main.sh

@@ -70,6 +70,8 @@ function gvm {
 	fi
 
     case "$COMMAND" in
+        l)
+            COMMAND="list";;
         ls)
             COMMAND="list";;
         h)

src/test/cucumber/gvm/mnemonics.feature

@@ -4,6 +4,11 @@ Feature: Mnemonics
     Given the internet is reachable
 
   Scenario: Shortcut for listing an uninstalled available Version
+    Given I do not have a "grails" candidate installed
+    When I enter "gvm l grails"
+    Then I see "Available Grails Versions"
+
+  Scenario: Alternate shortcut for listing uninstalled available Version
     Given I do not have a "grails" candidate installed
     When I enter "gvm ls grails"
     Then I see "Available Grails Versions"