Merge pull request #41 from squix78/add-protocol-abstraction

Add protocol/chipset abstraction

Author: squix78

.travis.yml

@@ -11,10 +11,12 @@ cache:
 env:
     - PLATFORMIO_CI_SRC=examples/SSD1306UiDemo
     - PLATFORMIO_CI_SRC=examples/SSD1306SimpleDemo
+    - PLATFORMIO_CI_SRC=examples/SSD1306ClockDemo
 
 
 install:
     - pip install -U platformio
+    - platformio lib install 44
 
 script:
     - platformio ci --lib="." --board=nodemcuv2