change slate to be a monorepo using lerna (#1106)

* init lerna, move files into ./packages

* move test files into ./packages

* more moving around

* fill out package.json files

* fixing imports

* more fixing of imports, and horribleness

* convert examples, fix linting errors

* add documentation

* update docs

* get tests passing

* update travis.yml

* update travis.yml

* update travis.yml

* update test script

* update travis.yml

* update scripts

* try simplifying travis.yml

* ocd stuff

* remove slate-core-test-helpers package

* add package readmes

* update reference docs structure

* refactor slate-simulator into its own package

* add docs for new packages

* update docs

* separate benchmarks into packages, and refactor them

docs/Summary.md

@@ -1,59 +0,0 @@
-
-- [Introduction](./Readme.md)
-
-
-## Walkthroughs
-
-- [Installing Slate](./walkthroughs/installing-slate.md)
-- [Adding Event Handlers](./walkthroughs/adding-event-handlers.md)
-- [Defining Custom Block Nodes](./walkthroughs/defining-custom-block-nodes.md)
-- [Applying Custom Formatting](./walkthroughs/applying-custom-formatting.md)
-- [Using Plugins](./walkthroughs/using-plugins.md)
-- [Saving to a Database](./walkthroughs/saving-to-a-database.md)
-- [Saving and Loading HTML Content](./walkthroughs/saving-and-loading-html-content.md)
-
-
-## Component Reference
-
-- [Custom](./reference/components/custom.md)
-- [Editor](./reference/components/editor.md)
-- [Placeholder](./reference/components/placeholder.md)
-
-
-## Model Reference
-
-- [Block](./reference/models/block.md)
-- [Character](./reference/models/character.md)
-- [Data](./reference//models/data.md)
-- [Document](./reference/models/document.md)
-- [Inline](./reference/models/inline.md)
-- [Mark](./reference//models/mark.md)
-- [Node](./reference/models/node.md)
-- [Selection](./reference/models/selection.md)
-- [Schema](./reference/models/schema.md)
-- [State](./reference/models/state.md)
-- [Text](./reference//models/text.md)
-- [Change](./reference/models/change.md)
-
-
-## Serializer Reference
-
-- [Html](./reference/serializers/html.md)
-- [Plain](./reference/serializers/plain.md)
-
-
-## Plugin Reference
-
-- [Plugin](./reference/plugins/plugin.md)
-- [Core](./reference/plugins/core.md)
-
-
-## Utils Reference
-
-- [Utils](./reference/utils/utils.md)
-
-
-## General
-
-- [FAQ](./general/faq.md)
-- [Resources](./general/resources.md)