Add powershell support, closes #40

ftplugin/ps1xml.vim

@@ -0,0 +1,31 @@
+" Vim filetype plugin file
+" Language:           Windows PowerShell
+" Maintainer:         Peter Provost <peter@provost.org>
+" Version:            2.10
+" Project Repository: https://github.com/PProvost/vim-ps1
+" Vim Script Page:    http://www.vim.org/scripts/script.php?script_id=1327
+
+" Only do this when not done yet for this buffer
+if exists("b:did_ftplugin") | finish | endif
+
+" Don't load another plug-in for this buffer
+let b:did_ftplugin = 1
+
+setlocal tw=0
+setlocal commentstring=#%s
+setlocal formatoptions=tcqro
+
+" Change the browse dialog on Win32 to show mainly PowerShell-related files
+if has("gui_win32")
+  let b:browsefilter = 
+        \ "All PowerShell Files (*.ps1, *.psd1, *.psm1, *.ps1xml)\t*.ps1;*.psd1;*.psm1;*.ps1xml\n" .
+        \ "PowerShell Script Files (*.ps1)\t*.ps1\n" .
+        \ "PowerShell Module Files (*.psd1, *.psm1)\t*.psd1;*.psm1\n" .
+        \ "PowerShell XML Files (*.ps1xml)\t*.ps1xml\n" .
+        \ "All Files (*.*)\t*.*\n"
+endif
+
+" Undo the stuff we changed
+let b:undo_ftplugin = "setlocal tw< cms< fo<" .
+      \ " | unlet! b:browsefilter"
+