0.2.0
* Added `set_names()` ; TODO: Add in some sanity checks
* Added support for `.default` to the `map_...()` functions and made them 
  behave more like purrr when it comes to extraction
* Added support for character-vector extraction to the `map_...()` functions
* Added `map_dfr()` alias for `map_df()`
* Added a set of commented-out examples at the end of `mappers.R` to show what
  functionality they support (there are purrr mirror functions with them). 
  TODO: Make these equivalence tests
* Switched home to gitlab but things push everywhere.
* Switched `walk()`ers to `for` loops

0.1.0 
* Initial release