Merge branch 'stable'

* stable:
  (GH-1141) Fix: Constant Proxy Null Reference Error
  (doc) Note PowerShell period limitation

src/chocolatey.resources/helpers/functions/Get-WebFile.ps1

@@ -133,7 +133,7 @@ param(
 	Write-Host "Using explicit proxy server '$explicitProxy'."
     $req.Proxy = $proxy
 
-  } elseif (!$webclient.Proxy.IsBypassed($url))
+  } elseif ($webclient.Proxy -and !$webclient.Proxy.IsBypassed($url))
   {
 	# system proxy (pass through)
     $creds = [net.CredentialCache]::DefaultCredentials

src/chocolatey.resources/helpers/functions/Get-WebFileName.ps1

@@ -130,7 +130,7 @@ param(
     Write-Debug "Using explicit proxy server '$explicitProxy'."
     $request.Proxy = $proxy
 
-  } elseif (!$client.Proxy.IsBypassed($url))
+  } elseif ($client.Proxy -and !$client.Proxy.IsBypassed($url))
   {
     # system proxy (pass through)
     $creds = [Net.CredentialCache]::DefaultCredentials

src/chocolatey.resources/helpers/functions/Get-WebHeaders.ps1

@@ -87,7 +87,7 @@ param(
     Write-Host "Using explicit proxy server '$explicitProxy'."
     $request.Proxy = $proxy
 
-  } elseif (!$client.Proxy.IsBypassed($url))
+  } elseif ($client.Proxy -and !$client.Proxy.IsBypassed($url))
   {
     # system proxy (pass through)
     $creds = [Net.CredentialCache]::DefaultCredentials

src/chocolatey/infrastructure.app/builders/ConfigurationBuilder.cs

@@ -416,6 +416,9 @@ the local options are parsed.
    (`` `""value`"" ``) or apostrophes (`'value'`). Using the combination
    allows for both shells to work without issue, except for when the next
    section applies.
+ * **Periods in PowerShell**: If you need to pass a period as part of a 
+   value or a path, PowerShell doesn't always handle it well. Please 
+   quote those values using ""Quote Values"" section above.
  * **Pass quotes in arguments**: When you need to pass quoted values to
    to something like a native installer, you are in for a world of fun. In
    cmd.exe you must pass it like this: `-ia ""/yo=""""Spaces spaces""""""`. In