feat(build): allow individual components to be build separately only

Individual components will have their .css/.js file generated under /dist/components, but are not included in semantic.css and semantic.js.

This is useful for including components in your project only if you need them, while keeping the file size of the main .css/.js file down.

To accomplish this, simply add a new array to your semantic.json:
```
"individuals": [
    form,
    modal,
    step
]
```

Don't forget to remove these items from the "components" array.

This change should be fully backwards compatible. It only changes the src variable if an "individuals" array has been defined in the config.

tasks/build/css.js

@@ -127,6 +127,13 @@ function buildCSS(src, type, config, opts, callback) {
     src      = config.paths.source.definitions + '/**/' + config.globs.components + '.less';
   }
 
+  if (globs.individuals !== undefined) {
+    const individuals = config.globs.individuals.replace('{','');
+    const components = config.globs.components.replace('}',',').concat(individuals);
+
+    src = config.paths.source.definitions + '/**/' + components + '.less';
+  }
+
   const buildUncompressed       = () => build(src, type, false, config, opts);
   buildUncompressed.displayName = 'Building uncompressed CSS';
 

tasks/build/javascript.js

@@ -99,6 +99,13 @@ function buildJS(src, type, config, callback) {
     src      = config.paths.source.definitions + '/**/' + config.globs.components + (config.globs.ignored || '') + '.js';
   }
 
+  if (globs.individuals !== undefined) {
+    const individuals = config.globs.individuals.replace('{','');
+    const components = config.globs.components.replace('}',',').concat(individuals);
+
+    src = config.paths.source.definitions + '/**/' + components + (config.globs.ignored || '') + '.js';
+  }
+
   // copy source javascript
   const js       = () => build(src, type, config);
   js.displayName = "Building un/compressed Javascript";

tasks/config/project/config.js

@@ -135,6 +135,14 @@ module.exports = {
       : '{' + defaults.components.join(',') + '}'
     ;
 
+    // components that should be built, but excluded from main .css/.js files
+    config.globs.individuals = (typeof config.individuals == 'object')
+      ? (config.individuals.length > 1)
+        ? '{' + config.individuals.join(',') + '}'
+        : config.individuals[0]
+      : undefined
+    ;
+
     return config;
 
   }