[explore-v2] setup, basic layout, control panels, v2 url (#1233)

* Explore control panel - Chart control, TimeFilter, GroupBy, Filters (#1205)

* create structure for new forked explore view (#1099)

* create structure for new forked explore view

* update component name

* add bootstrap data pattern

* remove console.log

* Associate version to entry files (#1060)

* Associate version to entry files

* Modified path joins for configs

* Made changes based on comments

* Created store and reducers (#1108)

* Created store and reducers

* Added spec

* Modifications based on comments

* Explore control panel components: Chart control, Time filter, SQL,
GroupBy and Filters

* Modifications based on comments

* accommodate old and new explore urls

* move bootstrap data up in scope

* fix code climate issues

* fix long lines

* fix syntax error

caravel/assets/javascripts/explorev2/index.jsx

@@ -0,0 +1,43 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import ExploreViewContainer from './components/ExploreViewContainer';
+
+import { createStore, applyMiddleware, compose } from 'redux';
+import { Provider } from 'react-redux';
+import thunk from 'redux-thunk';
+
+import { initialState } from './stores/store';
+
+const exploreViewContainer = document.getElementById('js-explore-view-container');
+const bootstrapData = JSON.parse(exploreViewContainer.getAttribute('data-bootstrap'));
+
+import { exploreReducer } from './reducers/exploreReducer';
+
+const bootstrappedState = Object.assign(initialState, {
+  datasources: bootstrapData.datasources,
+  datasourceId: parseInt(bootstrapData.datasource_id, 10),
+  datasourceType: bootstrapData.datasource_type,
+  sliceName: bootstrapData.viz.form_data.slice_name,
+  sliceId: bootstrapData.viz.form_data.slice_id,
+  vizType: bootstrapData.viz.form_data.viz_type,
+  timeColumn: bootstrapData.viz.form_data.granularity_sqla,
+  timeGrain: bootstrapData.viz.form_data.time_grain_sqla,
+  metrics: [bootstrapData.viz.form_data.metric].map((m) => ({ value: m, label: m })),
+  since: bootstrapData.viz.form_data.since,
+  until: bootstrapData.viz.form_data.until,
+  havingClause: bootstrapData.viz.form_data.having,
+  whereClause: bootstrapData.viz.form_data.where,
+});
+const store = createStore(exploreReducer, bootstrappedState,
+  compose(applyMiddleware(thunk))
+);
+
+ReactDOM.render(
+  <Provider store={store}>
+    <ExploreViewContainer
+      data={bootstrapData}
+    />
+  </Provider>,
+  exploreViewContainer
+);
+