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/o2.py

@@ -24,28 +24,30 @@
 import time, sys, signal, atexit
 import pyupm_o2 as upmO2
 
-# This was tested with the O2 Oxygen Concentration Sensor Module
-# Instantiate a O2 on analog pin A0
-myO2 = upmO2.O2(0)
+def main():
+    # This was tested with the O2 Oxygen Concentration Sensor Module
+    # Instantiate a O2 on analog pin A0
+    myO2 = upmO2.O2(0)
 
+    ## Exit handlers ##
+    # This stops python from printing a stacktrace when you hit control-C
+    def SIGINTHandler(signum, frame):
+        raise SystemExit
 
-## Exit handlers ##
-# This stops python from printing a stacktrace when you hit control-C
-def SIGINTHandler(signum, frame):
-	raise SystemExit
+    # This lets you run code on exit, including functions from myO2
+    def exitHandler():
+        print "Exiting"
+        sys.exit(0)
 
-# This lets you run code on exit, including functions from myO2
-def exitHandler():
-	print "Exiting"
-	sys.exit(0)
+    # Register exit handlers
+    atexit.register(exitHandler)
+    signal.signal(signal.SIGINT, SIGINTHandler)
 
-# Register exit handlers
-atexit.register(exitHandler)
-signal.signal(signal.SIGINT, SIGINTHandler)
+    while(1):
+        print "The output voltage is: {0}mV".format(
+        myO2.voltageValue())
 
+        time.sleep(.1)
 
-while(1):
-	print "The output voltage is: {0}mV".format(
-	myO2.voltageValue())
-
-	time.sleep(.1)
+if __name__ == '__main__':
+    main()