Add Gallery In-Page Experience API

Merge pull request brightcove#42 from brightcove/require-php-71

Bump php requirement from 5.6 to 7.1

Release 1.1.

Merge pull request brightcove#23 from ycecube/master

Move Subscription out from the Video namespace.

0.9 release.

Removes unnecessary Content-Length header hardcoding.

Adds proxy support to Client.

Adds missing label field.

Updates player API.