* Add RichEmbed#attachFile
Mostly for attaching local images that can be accessed within the embed image/author icon/footer icon via `attachment//filename.png` and the like.
* Update docstring to reflect valid param types
* Update TextBasedChannel.js
* Update RichEmbed.js
* Update RichEmbed.js
* add color resolvable, and color constants from the client
* fix up docs
* Update ClientDataResolver.js
* add easter eggs
* Update ClientDataResolver.js
* Update RESTMethods.js
Changed RichEmbed to take StringResolvables for all title, name, value and
description arguments.
Also changed a few lines in setColor to make sure that the value
assigned to this.color is always a number.
* RichEmbed Tweaks/Improvements
Changed .addTimestamp() to .setTimestamp() to bring it inline with all other single value settings.
Changed Field value to StringResolveable from String to bring it inline with typical sendMessage functionality.
* Lint Fix
* Remove Default, Add check for undefined
* Update faq.md (#949)
* fix docs
* Revert "fixed typo in documentation" (#950)
* new errors for richembed yay
Simplified the parsing for color arrays.
Throwing some errors on values that would result in Bad Requests.
Changed setAuthor and setFooter's icon parameter to icon_url to match
the embed object's property name.
Changed the docs for setFooter to reflect that icon_url is optional.
* changed docs instead of arg names
* capitalization
* Add more errors for RichEmbed builder char limits
Might as well if we're erroring on number of fields when that's the one limit that doesn't actually throw a bad request.
* Fix name.length check in previous commit
* Update RichEmbed.js
* Update number of fields error message
