* frontmatter functions now exported as curried constructors
* changed formats.js to accomodate frontmatter.js changes
* can only use custom delimiters if format is specified
* reverting changes
* updated tests to reflect changes
* created tests for custom delimiters
* updated docs to reflect addition of custom delimiter configuration
* formatByExtension no longer takes custom delimiter
* missed some formatByExtension calls
* Edited the docs according to suggestions
* Throws an error if a custom delimiter is set without declaring frontmatter format
* Throws error if custom delimiter set without explicit and proper frontmatter format being declared
* example config file set to proper defaults
* moved frontmatterFormats to formats
* Update .all-contributorsrc
* updated contributions
* Clarify docs
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