feat(sublime pkgs): use local cache of pkgs

- Sublime Package Control can run rampant with
    memory usage when installing 50+ new packages
    all at once, so prime it with a local cache instead
    of expecting everything to install on first startup
 - This also prevents all sorts of Sublime error dialogs
    as package setings are present, but packages may
    not exist yet

EthanBrown.SublimeText2.EditorPackages/tools/chocolateyInstall.ps1

@@ -27,6 +27,8 @@ try {
       Copy-Item @params
     }
 
+  $packageCache = Join-Path (Get-CurrentDirectory) 'PackageCache'
+  Install-SublimePackagesFromCache -Directory $packageCache
   Install-SublimePackageControl
   $packageControl = Join-Path $current 'Package Control.sublime-settings'
   Merge-PackageControlSettings -FilePath $packageControl