Fix Issue #26 and add new windows powershell routine

[dschrander]

Fixes issue #26 by configuring an array for the needed powershell features based on database choice , rather than installing all and removing unneeded features afterwards (which causes an error in new windows cookbooks, with new powershell routine.)

Also using new powershell routine from windows cookbook version >= '3'. Where all features are installed at once by the windows powershell feature, rather than looping through the array one by one (still used by older windows cookbooks, hence backward compatible)

[Annih]

28 will do the trick