Added some more diagnostics for failed 'travis' builds

Author: MrPointer

.travis.yml

@@ -18,6 +18,7 @@ before_install:
     export ARDUINO_SDK_FILE="arduino-$ARDUINO_SDK_VERSION-linux32.tar.xz"
   else
     export ARDUINO_SDK_FILE="arduino-$ARDUINO_SDK_VERSION-macosx.zip"
+    brew update
     brew upgrade cmake
   fi
 - wget "https://downloads.arduino.cc/$ARDUINO_SDK_FILE" -O "$ARDUINO_SDK_FILE"
@@ -38,5 +39,5 @@ script:
 - cmake -D CMAKE_TOOLCHAIN_FILE="../cmake/Arduino-Toolchain.cmake" ../examples
 - make
 after_failure:
-- ls -lR $ARDUNIO_SDK_PATH
+- ls -lR $ARDUINO_SDK_PATH
 - cat CMakeFiles/CMakeOutput.log