python_examples: Reformatted, self-checking, executable

* Moved body of each python example to main.  This allows for basic
      load module testing for CI
    * General cleanup of python modules (crlf/tabs/prints/etc)
    * Chmod'ed to 755 to allow running examples without specifying the
      python interpreter
    * Added ctest for loading python2/3 modules
    * Added jniclasscode pragma for java swig interface files.
    * Updated check_examplenames.py module to check all languages vs. a
      cxx example name
    * Added tests for checking python module and test loading
    * Added 'make test' to travis-ci run (run ctests)
    * Print a more meaningful message when not building cxx docs into
      python modules
    * Updated check_clean.py to only check java wrapper files
    * ENABLED ctests for UPM
    * Deleted using_carrays.py python example - this is covered by other
      examples

Signed-off-by: Noel Eck <noel.eck@intel.com>

examples/python/adxl345.py

@@ -23,19 +23,22 @@
 from time import sleep
 import pyupm_adxl345 as adxl345
 
-# Create an I2C accelerometer object
-adxl = adxl345.Adxl345(0)
+def main():
+    # Create an I2C accelerometer object
+    adxl = adxl345.Adxl345(0)
 
-# Loop indefinitely
-while True:
+    # Loop indefinitely
+    while True:
+        adxl.update() # Update the data
+        raw = adxl.getRawValues() # Read raw sensor data
+        force = adxl.getAcceleration() # Read acceleration force (g)
+        print "Raw: %6d %6d %6d" % (raw[0], raw[1], raw[2])
+        print "ForceX: %5.2f g" % (force[0])
+        print "ForceY: %5.2f g" % (force[1])
+        print "ForceZ: %5.2f g\n" % (force[2])
 
-    adxl.update() # Update the data
-    raw = adxl.getRawValues() # Read raw sensor data
-    force = adxl.getAcceleration() # Read acceleration force (g)
-    print "Raw: %6d %6d %6d" % (raw[0], raw[1], raw[2])
-    print "ForceX: %5.2f g" % (force[0])
-    print "ForceY: %5.2f g" % (force[1])
-    print "ForceZ: %5.2f g\n" % (force[2])
+        # Sleep for 1 s
+        sleep(1)
 
-    # Sleep for 1 s
-    sleep(1)
+if __name__ == '__main__':
+    main()