v3.0.0-rc3

A bugfix release, closes out a bunch of issues we found while using the rc.2 release. Mainly:

• File and directories with periods in the name do not screw things up now #384 #402 #403
• Images and other non-utf8 files compile through properly #398 #408
• Full support for unicode characters both in files and filenames #400
• Default template now namespaced as roots-base
• Moar tests, better coverage
• A shiny and wonderful new documentation system that looks great, works on desktop and mobile, rebuilds automatically each push, and is tightly versioned, so you can view the docs at the time of any release.

Note: If you have been actively using the prereleases for some reason, run roots tpl reset after installing this one to avoid any errors with creating new projects.