Travis CI Build for ArduinoIoTCloud

• Adding example used in conjunction with Travis CI to verify that no user facing API changes have been made
• Enable compilation of examples for both WiFi and GSM enabled boards
• Adding .travis.yml for automatic CI build of ArduinoIoTCloud
• Adding build badge to README

0.5.6

Increment library version

Cleaning up ambiguity concerning naming of thing id and device id.

Cleaning up ambiguity concerning naming of thing id and device id.

Notify user if thing id is wrong or thing does not exist

0.5.4

[CM-474] Notify user if thing id is wrong / thing does not exist (#43)

Refactoring source code + Minor Bugfixes

Separating definition/implementation in .h/.cpp files + Bugfix: Prevent socket from keeping open by stopping UDP

Change NTP and PING servers for non open internet connection

0.5.2

Release 0.5.2

GSM Connection Manager update

• refactored state machines for both ArduinoIoTCloud and ConnectionManager
• lifted a few cosmetic/logic issues
• cleanup
• added NTP time retrieval fallback

0.5.0

• added troubleshooting info via printDebugInfo()
• implemented printDebugInfo() in example
• fixed example variable name

0.4.0

bump version