Add CLD_ family of signal.h constants

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
Fix constants tests (false negative)

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
Store constants as regular python values

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
Add signalfd+epoll+pipe2+fork+exec demo

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
Update README

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
Bump version to 0.3

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>