Wrap response socket for platform compatibility.

Don't fallback to HTTP unless insecure_registry is specified when pushing/pulling

add support to add or drop capabilities

Restart Policy for Containers Implemented fixes #302

Closes #282

Volumes parameter on create_container should be validated as string

Stop timeout should be added to the request timeout

Using the max of the stop timeout and request timeout did not entirely
make sure that a stop timeout greater than a request timeout wouldn't
fail prematurely with a HTTPTimeout exception. The correct behavior is
to add the timeouts together, as the stop timeout is understood to be
part of the "request processing time". Any transport-level timeout thus
comes in addition to that.
Signed-off-by: Maxime Petazzoni <max@signalfuse.com>

Adding units specification to mem_limit variable

Don't use pinned dependencies

Signed-off-by: Daniel Nephin <dnephin@gmail.com>

Added a timeout to the https ping

For those not using https who might have it firewalled, this request without a timeout causes significant delay. Adding a moderately generous timeout shouldn't affect anyone negatively, but will make things a bit nicer otherwise.

Fix travis badge URL