modernize winrm setup and fix for 2008r2

[mwrock]

The default user_data is broken on 2008R2. It currently runs:

Enable-PSRemoting -Force -SkipNetworkProfileCheck

The SkipNetworkProfileCheck argument is not available on powershell versions prior to 3.0. Windows 2008R2 ships with 2.0 by default. On 2008R2, this command returns:

PS C:\Users\Administrator> Enable-PSRemoting -Force -SkipNetworkProfileCheck
Enable-PSRemoting : A parameter cannot be found that matches parameter name 'SkipNetworkProfileCheck'.
At line:1 char:50
+ Enable-PSRemoting -Force -SkipNetworkProfileCheck <<<<
    + CategoryInfo          : InvalidArgument: (:) [Enable-PSRemoting], ParameterBindingException
    + FullyQualifiedErrorId : NamedParameterNotFound,Microsoft.PowerShell.Commands.EnablePSRemotingCommand

This PR also removes the insecure configuration settings of allowing basic auth and unencrypted traffic. The winrm gem has been using NTLM auth by default for over a year and these settings are no longer necessary and unwanted.

fixes #303

Signed-off-by: Matt Wrock matt@mattwrock.com