`compass` now compiles only `app.scss`

* To reinforce only one nonpartial SASS file to the project, `compass`
	task now compiles only the `app.scss`
* `app.scss` was moved to `src/` in order to be more consistent with
	`src/javascript.coffee`, a file that imports all others in root path
* Additionally, `processhtml` has been added, and by doing so, the
	changes on *.html have become standarized

NOTE: `paths.*.root` has been modified in flavour of `compass.specify` option.
NOTE²: `imagemin` applied only on production environment and after sprites generation, to include them to optimization.