Add temporary fix for VirtualBox Additions 4.3.10 issue

VirtualBox Guest Additions version 4.3.10 misses to add a symlink during
installation which results in Vagrant not being able to mount shared
folders. See VirtualBox ticket #12879:
https://www.virtualbox.org/ticket/12879.

Signed-off-by: Gregor Zurowski <gregor@zurowski.org>
Merge remote-tracking branch 'upstream/master' into Ubuntu-14.04-VboxAdd-Fix
Merge pull request #941 from gzurowski/Ubuntu-14.04-VboxAdd-Fix

Add temporary fix for VirtualBox Additions 4.3.10 issue
Add Debian-7.5.0-amd64-netboot template
Add Debian-7.5.0-i386-netboot template
Update ISO src for archived Debian
Merge pull request #943 from kipit/fix_debian_lt_75_iso_src

Update ISO src for archived Debian
Merge pull request #942 from kipit/add_debian_75_template

Add Debian 7.5.0 templates
Fix VMWare Fusion 6 compatability

Make vmx file generation compatible with the latest VMWare Fusion 6. 

We still have to specify boot order for Fusion 6*, otherwise some OS wouldn't load. Could be easily reproduced with windows-2008R2-serverstandard-amd64-winrm, without bootOrder the VM wouldn't start installation.
Merge pull request #944 from artemyarulin/Fusion6-compatibly-fix

Fix VMWare Fusion 6 compatability
Add templates for Scientific Linux 6.5

Only contains updated mirror and iso urls.
Added install instructions for OS X Mavericks + XCode 5.1
Merge pull request #948 from kieran-bamforth/master

Added install instructions for OS X Mavericks + XCode 5.1
Merge pull request #947 from DavidS/add-scientificlinux-6.5-templates

Add templates for Scientific Linux 6.5
Fix VirtualBox Addition installation to support VirtualBox >= 4.2.2
Merge pull request #949 from reuveniy/master

Fix VirtualBox Addition installation to support VirtualBox >= 4.2.2
Adding OpenBSD 5.5
Merge pull request #950 from braddeicide/OpenBSD5.5

Adding OpenBSD 5.5
Minor documentation typo fix
Merge pull request #952 from zerkms/patch-1

Minor documentation typo fix