v1.2.0

Release v1.2.0

Added separated void validate_ambient() to CAPS class.
This function throws if ambient class was modified,
but throw is not reason for abort; it can be treated
as a warning or ignored completely. Throw'd message
contains information about action performed, so it
tells what capabilities were removed from ambient
set due to them missing from required bounding,
inheritable and permited sets.

Signed-off-by: Oskari Rauta <oskari.rauta@gmail.com>