Objectifies keys container and adds sorting.
Make prompt output constant, color, and add default.
Extracted console and enriched output.
Add locale_merge_path and default.

Also fixes broken tests due to writing locale file.
Only ask the user if the keys aren't equal.
Extract merge handler.
Remove unused console printer.
Updates readme.
Refactor to use private accessors.
Merge pull request #9 from tylerdooling/master

Adds interactive merge feature, fixes tests, and refactors code for merging with existing locale file.