Bump version to 0.6.2
docs: Rephrase the LVM limitation

Make sure the user understands that this limitation has to do with the
input media internals and not with the place where the input media
itself is stored.
Use "which" to check if WinEXE is installed

The function distutils.spawn.find_executable is not available in
Ubuntu 14.04
Add .kamaki.log to the sensitive user data list

Make sure ~/.kamaki.log is removed when sensitive user data are
cleared out.
Fix a bug in clear_logs sysprep for Windows

Prior to this the command would fail if the system contained logs which
contain spaces in their name
Add Dionysis Grigoropoulos to the authors list
docs: get the version from version.py

Automatically load the version from the version.py file
Update ChangeLog and version files for 0.6.2
Merge branch 'hotfix-0.6.2'
Merge branch 'master' into develop

Bump version to 0.6.2next
Switch license to GPLv3

According to the decision of the GRNET Board of Directors,
switch license to GPLv3.

This commit will be propagated to the release
and master branches based on git flow, and the next
release will be licensed as GPLv3.
Add a context manager for opening hive files

Add a context manager in windows.py for reading and writing hive
files. Whenever a method needs to access the Windows registry it should
use this context manager.
Convert windows.py module into a package

As the windows module got bigger and bigger we had to break it into more files
Add sysprep params before init is executed

In add_sysprep_param __init__ decorator, add the sysprep parameters
before executing the init function. This is needed if we want to be
able to access the sysprep_params dictionary from within __init__.
Move winexe.py module inside the windows package
windows: Move code from Windows class to VM

Move all helper methods that control the Winodows VM from Windows to
VM class
windows: split do_sysprep to reduce complexity

Add a new _exec_sysprep_tasks method that is called by do_sysprep and
hosts the actual code for executing the system preparation tasks
windows: Create a new registry module

This modules hosts the Registry class which contains all the registry
manipulation code previously hosted under the Windows class
Fix a bug in sysprep param handling in dialog_menu

If the needed sysprep parameters had all default values,
snf-image-creator would crash when trying to run the image
customization. This bug could not be triggered from the current os_type
classes.
windows: Reset the password when customizing

Don't ask the user to enter an Administrator password before cleaning up
a Windows image. Reset the password before starting the process and
assign the old value if needed at the end.