Large update for all components

reorganization, linting, updating file imports, consolidation
warning: there will be errors in this commit
todo: update webpack, add missing styles, scss files, consolidate the rest of components within features/*

app/javascript/gabsocial/components/__tests__/__snapshots__/button-test.js.snap

@@ -1,8 +1,8 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`<Button /> adds class "button-secondary" if props.secondary given 1`] = `
+exports[`<Button /> adds class "button--secondary" if props.secondary given 1`] = `
 <button
-  className="button button-secondary"
+  className="button button--secondary"
   onClick={[Function]}
   style={
     Object {

app/javascript/gabsocial/components/__tests__/button-test.js

@@ -65,7 +65,7 @@ describe('<Button />', () => {
     expect(tree).toMatchSnapshot();
   });
 
-  it('adds class "button-secondary" if props.secondary given', () => {
+  it('adds class "button--secondary" if props.secondary given', () => {
     const component = renderer.create(<Button secondary />);
     const tree      = component.toJSON();