Add windows testing

[matschaffer]

To avoid regression we'll need to set up a way to run knife-solo on a windows workstation and also agains a windows node.

See info from this comment and information from bill's kitchen

@tknerr and @dkinzer may have input on this issue.

[tknerr]

One simple unit test would probably be to mock windows_client? and ensure that the path is adjusted with /cygdrive/... if so.

This is what failed in 0.3.0.pre1:

Starting 'W:/tools/ruby/ruby-1.9.3-p385-i386-mingw32/lib/ruby/gems/1.9.1/gems/knife-solo-0.3.0.pre1/lib/chef/knife/patches/parser.rb'
rsync -rl --chmod=ugo=rwX --rsh="ssh vagrant@33.33.99.11 -i W:/home/.vagrant.d/insecure_private_key"  --exclude revision-deploys --exclude tmp --exclude '.*'  W:/tools/ruby/ruby-1.9.3-p385-i386-mingw32/lib/ruby/gems/1.9.1/gems/knife-solo-0.3.0.pre1/lib/chef/knife/patches/parser.rb :./chef-solo/cookbooks/chef_solo_patches/libraries
bash: W: command not found
rsync: connection unexpectedly closed (0 bytes received so far) [Receiver]
rsync error: error in rsync protocol data stream (code 12) at /home/lapo/package/rsync-3.0.9-1/src/rsync-3.0.9/io.c(605) [Receiver=3.0.9]
ERROR: RuntimeError: Failed to launch command rsync -rl --chmod=ugo=rwX --rsh="ssh vagrant@33.33.99.11 -i W:/home/.vagrant.d/insecure_private_key"  --exclude revision-deploys --exclude tmp --exclude '.*'  W:/tools/ruby/ruby-1.9.3-p385-i386-mingw32/lib/ruby/gems/1.9.1/gems/knife-solo-0.3.0.pre1/lib/chef/knife/patches/parser.rb :./chef-solo/cookbooks/chef_solo_patches/libraries
rake aborted!

This is what worked previously in 0.2.0 and then again after #201 had been merged:

Starting 'W:/tools/ruby/ruby-1.9.3-p385-i386-mingw32/lib/ruby/gems/1.9.1/gems/knife-solo-0.3.0.pre2/lib/chef/knife/patches/parser.rb'
rsync -rl --chmod=ugo=rwX --rsh="ssh vagrant@33.33.99.11 -i W:/home/.vagrant.d/insecure_private_key"  --exclude revision-deploys --exclude tmp --exclude '.*'  /cygdrive/W/tools/ruby/ruby-1.9.3-p385-i386-mingw32/lib/ruby/gems/1.9.1/gems/knife-solo-0.3.0.pre2/lib/chef/knife/patches/parser.rb :./chef-solo/cookbooks/chef_solo_patches/libraries
W:/tools/ruby/ruby-1.9.3-p385-i386-mingw32/lib/ruby/gems/1.9.1/gems/knife-solo-0.3.0.pre2/lib/chef/knife/patches/parser.rb finished in 0.905615 seconds