Bump Ruby version to 1.9.3

OS X 10.8 doesn't have a build, and for some reason RVM doesn't want to build it from source:

	$ rvm install ruby-1.9.2-p320
	No binary rubies available for: osx/10.8/x86_64/ruby-1.9.2-p320.
	Continuing with compilation. Please read 'rvm mount' to get more information on binary rubies.
	The provided compiler '/usr/bin/gcc' is LLVM based, it is not yet fully supported by ruby and gems, please read `rvm requirements`.
ignore .ruby-version
Fixed doc/requirements.md to include PowerShell and PowerShell Community Extensions under Windows

1) Fixed doc/requirements.md to include installing PowerShell and the PowerShell
   Community Extensions (PSCX) under Windows. PowerShell is used for scripting
   under Windows, and PSCX supplies several necessary cmdlets including
   Write-Tar.
Point Cygwin download to x86 version of exe (as they now have distinct 32/64 bit versions)
Actually set root password in freebsd-9.X templates
Add SUNWgccruntime to Solaris 10 builds

This package supports 3rd-party binaries built with the Sun/Oracle version of
GCC. Increase in exported VM size is negligible.
don't generate so much noise extracting vmware tools
Expand vbox documentation for reference and to give newbies a better starting place
update for VMWare Fusion provider to recognize Fusion 6.x and Hardware Version 10
ADD Readme.md manifest file
Add Debian 7.2.0 i386 and amd64 templates

Fixes GH-821.
add Debian 7.0 ISO download instructions
update Debian 7.1.0 ISO download URL
Merge pull request #824 from 3flex/debian-7.2.0

Add Debian 7.2.0 i386 and amd64 templates
Merge pull request #825 from 3flex/update-stale-debian-ISO-URLs

Update stale debian ISO URLs
Merge pull request #813 from kalefranz/fusion_6_update

update for VMWare Fusion provider to recognize Fusion 6.x
Merge pull request #814 from mediadoneright/readme-manifest

ADD Readme.md manifest file to template: ubuntu-12.04.3-desktop-i386
Merge pull request #787 from pdericson/master

Actually set root password in freebsd-9.X templates
Merge pull request #811 from mediadoneright/expand-vbox-docs

Expand vbox.md docs: improve references and easier starting place for newbies
Merge pull request #793 from Sharpie/solaris-install-gcc-runtime

Add SUNWgccruntime to Solaris 10 builds