[added] Deprecation warning for individual file use in the Bower release

Preparatory step for react-bootstrap#693

Author: mtscout6

src/utils/deprecationWarning.js

@@ -8,7 +8,7 @@ export default function deprecationWarning(oldname, newname, link) {
     console.warn(message);
 
     if (link) {
-      console.warn(`You can read more about it here ${link}`);
+      console.warn(`You can read more about it at ${link}`);
     }
   }
 }

tools/amd/build.js

@@ -14,7 +14,10 @@ const bowerJson = path.join(bowerRoot, 'bower.json');
 const readme = path.join(__dirname, 'README.md');
 const license = path.join(repoRoot, 'LICENSE');
 
-const babelOptions = {modules: 'amd'};
+const babelOptions = {
+  __reactBootstrapDeprecationWarning: true,
+  modules: 'amd'
+};
 
 const libDestination = path.join(bowerRoot, 'lib');
 const factoriesDestination = path.join(libDestination, 'factories');

tools/buildBabel.js

@@ -12,7 +12,13 @@ export function buildContent(content, filename, destination, babelOptions={}) {
 }
 
 export function buildFile(filename, destination, babelOptions={}) {
-  const content = fs.readFileSync(filename, {encoding: 'utf8'});
+  let content = fs.readFileSync(filename, {encoding: 'utf8'});
+  if (babelOptions.__reactBootstrapDeprecationWarning) {
+    content = `console.warn('This file is deprecated, and will be removed in v0.24.0. Use react-bootstrap.js or react-bootstrap.min.js instead.');
+console.warn('You can read more about it at https://github.com/react-bootstrap/react-bootstrap/issues/693');
+${content}`;
+  }
+
   if(babelUtil.canCompile(filename)) {
     // Get file basename without the extension (in case not .js)
     let outputName = path.basename(filename, path.extname(filename));