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.