Now all helpers can be overridden by custom implementations without editing JB source. Just define a helper's 'engine' as 'custom' in the _config.yml file and provide a helper file of the same name in _includes/custom/. This helps users cleanly upgrade JB versions since they no longer need to edit the files directly.
This is because 'setup' will need to be included in every post/page file if we want to have access to BASE_PATH. So I figure 'setup' will be a good access path for any future inclusions we need to make
This makes GitHub Pages for projects support possible as all urls will need to call on the project's subfolder. The other important piece is that urls should resolve to root locally but be able to change when in production. LLastly this gives themes clear integration points for working with paths. (the jbcache hack just makes it so there is not unnecessary whitespace output in the source.
The new system will try to namespace all framework integrations with 'JB'. Integration points added in this comment are 'analytics', 'comments', and 'sharing'.
