Merge pull request #1 from lmendezr/adding-platform-support

Adding platform support

Merge pull request usernein#15 from DenyThis/adding-platform-support

Add support for roku platform via user specified remote_entity or by defaulting to remote.{{entity_id}}

Move global vars into object

To fix conflicts between multiple instances of the card
(see usernein#12)

Fix slider_config

Thanks @idoaflalo (usernein#11)

Changing icons and adding warning about slider

Give priority to the icon in custom button

Documenting custom icons

Add support for custom buttons

Improving README
Changing demo screenshot

Fix calls to sendKey

Fix calls to sendKey