Replace the *.vimp file extension with config specific extensions.

pentadactyl/NEWS

@@ -18,6 +18,7 @@
       - Backtracks to the first successful match after pressing
         backspace.
       - Supports reverse incremental search.
+    * Command script files now use the *.penta file extension.
     * Multiple Ex commands may now be separated by |
     * Command-line is now hidden by default. Added C and M to
       'guioptions'.

pentadactyl/content/dactyl.dtd

@@ -13,6 +13,7 @@
 <!ENTITY dactyl.maillist "pentadactyl@googlegroups.com">
 <!ENTITY dactyl.host "&brandShortName;">
 <!ENTITY dactyl.hostbin "firefox">
+<!ENTITY dactyl.fileExt "penta">
 <!ENTITY dactyl.statusBefore "statusbar-display">
 <!ENTITY dactyl.statusAfter "">