[ThemeModifier] Added delete support

Added delete support by adding a `data-cluckles-delete` attribute to
subscribers, with a selector specified, as the target to add a Delete
Event too
[Example] Changes Navbar component's to use container-fluid, and added navbar-text example
[Example] Added delete buttons to all modifier inputs
[Docs] Added UA Events to Index Buttons
[Processor] Allowing matching `[]` in `cssSelectorRegex`
[Import] removed `customStylesHeader` as it isn't needed
[Docs] Added Permalinks/Updated pages to use friendly URL's
[Export] Added Google Analytics Tracking for Download Buttons. Close #14
[Package] Updated Cluckles to 0.10.0