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.
Add template for latest Ubuntu 12.04.

Ubuntu has removed the previous version from their servers.
Add veewee parallels export command.
Merge pull request #801 from fillpdfservice/master

Add veewee parallels export command.
Merge pull request #799 from fillpdfservice/feature/template-precise-12.04.3

Add template for latest Ubuntu 12.04.
Export templates and optimize before export. GH-800

Now the templates import properly into vagrant-parallels.
Merge pull request #802 from wizonesolutions/feature/improve-parallels-export-800

Export templates and optimize before export. GH-800
Tweaks to definition.rb to use correct shutdown command.

postinstall.sh -> postinstall.csh since it's really going to be run by
csh. Fixes in the file to ensure "fetch" command is used correctly. Also
added virtio kmod build so that virtualbox virtio network interface can
be used.
Merge pull request #803 from lukebakken/freebsd-fixes

Fixes for FreeBSD 9.1 template files.
don't generate so much noise extracting vmware tools
replace dead mirror with kernel.org
Merge pull request #806 from uu59/reset_deadlink_of_archlinux_x86_64

replace dead Arch mirror with kernel.org
Documentation syntax fix: howto create and checkout a new_patch branch

: lowercase
Merge pull request #807 from mediadoneright/fix-contribute

Documentation syntax fix: howto create and checkout a new_patch branch
Add Ubuntu 12.04.3-i386 template 

Based on ubuntu-13.04-server-amd64 template commit: 5344f0e
https://github.com/jedi4ever/veewee/commit/5344f0ed2a40938bb2dec406ec0461b5b726ede8