Merge pull request #4 from fpemud/bugfix

fix

Change inspect.getargspec() to inspect.signature() for python3.

Update CHANGELOG.md

Up security section

Move contentent

Merge pull request #2 from judy2k/patch-1

Some idiomatic english corrections.

fix security.md

add note about security

create v1.4

up docs

revert Inject to Process based status

set to None default values for 6 ns flags in Container.__init__ and setns

revert Inject to Process based state, up setns and cli