(#310) Ensure correct loading of profile

During testing, it was found that the Chocolatey Profile was not being
correctly loaded, with neither  Update-SessionEnvironment nor
refreshenv working as expected.

This commit changes the profile loading to explicitly set the alas for
refreshenv, and also to load Update-SessionEnvironment as a Cmdlet,
rather than a Funcation.  This is needed since it is now written in C#
rather than PowerShell.

src/chocolatey.resources/helpers/chocolateyProfile.psm1

@@ -25,7 +25,9 @@ Import-Module "$thisDirectory\Chocolatey.PowerShell.dll" -Cmdlet "Get-Environmen
 . $thisDirectory\functions\Write-FunctionCallLogMessage.ps1
 . $thisDirectory\ChocolateyTabExpansion.ps1
 
-Export-ModuleMember -Alias refreshenv -Function 'Update-SessionEnvironment', 'TabExpansion'
+Set-Alias refreshenv Update-SessionEnvironment
+
+Export-ModuleMember -Alias refreshenv -Cmdlet 'Update-SessionEnvironment' -Function 'TabExpansion'
 
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