Initial back-end work

- Added custom post types (Artists, Releases, Videos)

- Added placholder meta boxes to custom post types for future use

- Registered custom navigation menus and sidebars

- Added custom widgets for Releases and MailChimp subscribe form.
MailChimp widget has option fields where the MailChimp API Key and List
ID can be entered

- Installed Contact Form 7 plugin

- Added filter that will route Contact Form 7 submissions through
MailChimp, to be used in the subscribe widget (still need to implement
the actual form)

- Added code to include post meta fields in search results once the
fields have been created and posts have been added

- Added code to override some of the Skeleton theme's default structure

- Added skeleton HTML structure for home page. Still need to populate
with content.