Fixes for Picroft and general bug fixes

General enhancements

• Changed network timeout to improve disconnected behavior (#461). This is most important when first bringing up a unit which has no network connection configured yet.
• Updating 'requests' package version in requirements.txt (#464). This fixes sporadic SSL3 errors that were appearing in the logs with long STT requests on some platforms.
• Pairing now says "zero" instead of "oh" (#401)
• NEW: Skills will load from one-level-deep subfolder. This makes it simpler to use git to install a group of skills if the author keeps several in one repo. For example, it will now find "/opt/mycroft/skills/bobs_skills/calendar/init.py" as well as "/opt/mycroft/skills/bobs_calendar/init.py"

Picroft support

• Stop splitting speech at period when on Picroft (#466). The lockup that can happen with analog audio output (an issue with Raspbian/Pi hardware) happen much less frequently.

Developer tools

• Fixed unit tests, added "cleanup" to prevent blocking (#453)
• Added skill_container to packaged distribution (#450)
• Bringing Google TTS support up to speed (#454)
• Update build_host_setup_arch.sh for Arch Linux (#459)