Closes #52

Add task drupal:run_makefiles and chain it to drupal:symlink_config_file.

It's essentially optional, just need to set :drush_makefiles to either a String
or an Array (nil by default) and it will attempt to run the makefiles or keep
on with the rest of the drupal tasks
Add common tasks for nested wordpress installs
Version bump to 1.4.0
Faster Magento deploys

Refactor usage of `ash:fixperms` after compiling and uploading sass
stylesheets. Instead of a sledge hammer approach, we can target the
`skin` directory to run `set_perms_files` and `set_perms_dirs`.
Merge branch 'release/v1.4.0' into develop