Start adding SMS (text message) send/receive/parse functions.

This commit breaks almost everything. Refer to the main branch ("master")
for the latest stable code.
bring linked libraries up to date
Revert "bring linked libraries up to date"

This reverts commit ad1d8b214ba15868f29ca10c1a533a00a7440cbc.
Merge branch 'master' into GSM-integration
typo fix in license header
Merge branch 'master' into GSM-integration

Conflicts:
	software/turbidimeter/turbidimeter.ino
Update README.md
SMS parsing update
merge Master into GSM-integration
implement inbound SMS parsing