-js-css target should modify .~build/ files and not the working directory

[raamdev]

Forking from #68 (comment).

The new -js-css target currently modifies files in the repo. It should only modify files in .~build/ (see discussion).

However, we can't change it to modify files in .~build/ until we modify the rest of the build system to allow for sourcing the packages from .~build/. (Currently packaging happens before .~build/ is populated and the distributable packages are sourced from the repo directory, not the .~build/ directory.)

This work will be related to #80.

[jaswrks]

Thanks for opening this. I began some work on this over the weekend so I now need to pull together some of the recent changes you've added to that and then open a PR for your review. I worked to better organize the targets and there are a few changes throughout that make this possible.

[jaswrks]

This will be corrected by: #83

[jaswrks]

Resolved by https://github.com/websharks/phings/releases/tag/160416