Introduce get_spine_option() for retrieval of specific spine options

This replaces the option handling that was previously done in the
header template.
Convert spine option usage in header template to new function
Call spine_get_option() directly when needed throughout header
Temporary - s/binder_broken/broken_binding/
Use get_spine_option() for broken_binding
Enqueue extra theme styles through wp_enqueue_scripts

We'll add some logic in here for how styles should be called when
a child theme is in use.
Change how scripts are enqueued for the parent and child themes

Includes a description of behavior and instructions for removing
the parent styles when required.
Fix broken broken_binding logic
Add a note via HTML comment for scripts and styles
Use spine_get_option for spine_color
Apply special logic to 'bleed' option in spine_get_option
Remove reference to unused global $cropping
Introduce spine_social_options() to replace inline functionality
Spacing tweak
Move contact options to spine_get_option()
'bleed' should have a default of false for good measure
Provide filters for child themes and plugins to override spine options
Merge pull request #27 from washingtonstateuniversity/spine-options

[PR] Introduce spine_get_option()