Removed Domain-Check for Multiple Keys

Now allows for an array of WP Remote API Keys. Will test each until a
valid key is found.
Added "Settings" link to Admin Notice and Plugin Listing to access
Plugin Settings Page.
Removed function which reset the (single) API Key on
Activation/Deactivation of Plugin, as this can now be done at any time
through the Settings Page.
Removed Domain-Check for Multiple Keys

Now allows for an array of WP Remote API Keys. Will test each until a
valid key is found.
Added "Settings" link to Admin Notice and Plugin Listing to access
Plugin Settings Page.
Removed function which reset the (single) API Key on
Activation/Deactivation of Plugin, as this can now be done at any time
through the Settings Page.