Add config defaults and disableOnInput to callback invocation

[jordpo]

• registers config on the container for key-manager service to access
• sets defaults based on presence in config
• currently supports one default - disableOnInput
• guards callback if option is turned on for combo

@patrickberkeley

[jordpo]

fixes #5

[jordpo]

[Epic][WB] Key bindings lost on click

[jordpo]

Will do! Also not sure why the Travis build is failing for some reason. I did do a force push with my first commit.