Use correct separator in keywords.txt

The Arduino IDE requires the use of a tab separator between the name and identifier. Without this tab the keyword is not highlighted.

Reference: https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.5:-Library-specification#keywords

Update GSM lib version

Due to website configuration changes, every url starting with http://…

…arduino.cc has been changed to http://www.arduino.cc. Fixes #3191

Libraries: added help files to mitigate missing contextual reference …

…issue

Bundled libraries update

Lib: GSM version bump

Libraries: version now compliant with semver. See http://semver.org/