add support for ps1

doc/NERD_commenter.txt

@@ -804,6 +804,7 @@ if your face looked like a toaster and a t-rex put together? :(
     - make haml comments default to -# with / as the alternative delimiter,
       thanks to tpope
     - add support for actionscript and processing thanks to Edwin Benavides
+    - add support for ps1 (powershell), thanks to Jason Mills
 
 2.2.0
     - rewrote the mappings system to be more "standard".
@@ -990,7 +991,7 @@ Stefano Zacchiroli                  debcontrol, debchangelog, mkd
 Alex Tarkovsky                      ebuild and eclass
 Jorge Rodrigues                     gams
 Rainer Müller                       Objective C
-Jason Mills                         Groovy
+Jason Mills                         Groovy, ps1
 Normandie Azucena                   vera
 Florian Apolloner                   ldif
 David Fishburn                      lookupfile

plugin/NERD_commenter.vim

@@ -627,6 +627,8 @@ function s:SetUpForNewFiletype(filetype, forceReset)
         call s:MapDelimiters('/*','*/')
     elseif a:filetype == "prolog"
         call s:MapDelimitersWithAlternative('%','','/*','*/')
+    elseif a:filetype == "ps1"
+        call s:MapDelimiters('#', '')
     elseif a:filetype == "psf"
         call s:MapDelimiters('#', '')
     elseif a:filetype == "ptcap"