Prior to this change the Grunt stylelint command was too greedy when
determining which files hsould be linted.
This change modifies the watch command to only watch relevant files and
subdirectories of each component directories. This means that unrelated
CSS and SCSS files are no longer watched for changes, and has the added
benefit of significantly increaseing the startup speed of grunt.
Without this patch applied the watch tasks were checking for matches in
the node_modules, and vendor directories.
Prior to this change all Grunt features were in a single Gruntfile.js
but this has become difficult to manage and maintain.
This commit moves the existing dependencies for component calculation
and babel moduel definition into a new .grunt directory, and
restructures the existing tasks in Gruntfile.js into separate task
configuration files.
This improves the maintainability of the Grunt build system and allows
for easier future expansion.
