add Bootstrap working example

• re-organize file structure with one directory per dialog
• add index.html file per dialog
• add bootstrap styling and dynamic cdn loading
• clean up react code and stylesheet

npm setup script update

adds force flag
"setup": "rm -f .clasp.json ..."

Update README.md

Move clasp to devDependencies

update dynamic cdn urls

Add repository field

src/server/index.js

@@ -4,6 +4,7 @@ import * as publicSheetFunctions from './sheets';
 // Expose public functions by attaching to `global`
 global.onOpen = publicUiFunctions.onOpen;
 global.openDialog = publicUiFunctions.openDialog;
+global.openDialogBootstrap = publicUiFunctions.openDialogBootstrap;
 global.openAboutSidebar = publicUiFunctions.openAboutSidebar;
 global.getSheetsData = publicSheetFunctions.getSheetsData;
 global.addSheet = publicSheetFunctions.addSheet;