closes#6604
* Default for `to` was always `(from-1) + limit`. This caused a problem
where the `to` value could be higher than the length of the number of
blog posts, causing `@last` to never be called/reached
* Now sets `to` to have a default of `length` and if a limit was sent
through and not higher than `length`, to then set `to` to that value
* Added some extra tests for `@last` and `@first` use cases
* Added some inline commenting
no issue
- In Ghost, 'context' means the page or section of a blog we're currently within
when rendering a theme, e.g. 'post' or 'tag' or 'home'.
- In handlebars 'context' refers to the blob of JSON that is tied to a template.
- These two uses of the word 'context' have gotten very confusing, so I've removed all usage of 'context' within the Ghost handlebars helpers, EXCEPT where they actually refer to the current context (e.g. the is helper)
refs #4439
- Brings our custom foreach helper (which has extra features) back into line with Handlebar's own each helper
- Adds a new @number variable to foreach, so that building numbered lists is PEASY
- Improved the existing tests, and added a few more
no issue
- Split theme helpers into individual files for each
- Do the same for tests
- Have utils to share some things between them
- Move assetHash onto config
