Replace default cd alias with cd function

Define cd to work more like Unix/Linux:

* No path argument changes to the users home directory
* Passing "-" for the path argument changes to the previous directory

alias.ps1

@@ -1,5 +1,5 @@
-# Remove builtin aliases
-Remove-Item Alias:curl
-Remove-Item Alias:wget
-Remove-Item Alias:cd
-Remove-Item Alias:rm
+# Remove these aliases to PowerShell builtins which clobber the actaul exes.
+Remove-Item alias:curl
+Remove-Item alias:wget
+Remove-Item alias:cd
+# TODO: Remove default abbriviation aliases

utils.ps1

@@ -13,32 +13,4 @@ function cd {
   Set-Location -Path $Path
 }
 
-function rm {
-  Param (
-    [Parameter(
-      Mandatory=$true,
-      ValueFromRemainingArguments=$true
-    )][string[]]$Paths,
-    [switch]$F,  [switch]$Force,
-    [switch]$R,  [switch]$Recurse,
-    [switch]$RF, [switch]$FR
-  )
-  $Command = "Remove-Item"
-  if ($F -or $Force -or $RF -or $FR) {
-    $Command = "$Command -Force"
-  }
-  if ($R -or $Recurse -or $RF -or $FR) {
-    $Command = "$Command -Recurse"
-  }
-  foreach ($Path in $Paths) {
-    Invoke-Expression -Command "$Command $Path"
-  }
-}
-
-# Add new aliases
-function touch {
-  Param (
-    [string]$Path
-  )
-  New-Item -Type File $Path
-}
+# TODO: Define rm to work with -rf and multiple entries