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/slide.py

@@ -23,17 +23,20 @@
 from time import sleep
 import pyupm_slide as slide
 
-# New Grove Slider on AIO pin 0
-slider = slide.Slide(0)
+def main():
+    # New Grove Slider on AIO pin 0
+    slider = slide.Slide(0)
 
-# Loop indefinitely
-while True:
+    # Loop indefinitely
+    while True:
+        # Read values
+        raw = slider.raw_value()
+        volts = slider.voltage_value()
 
-    # Read values
-    raw = slider.raw_value()
-    volts = slider.voltage_value()
+        print "Slider value: ", raw , " = %.2f" % volts , " V"
 
-    print "Slider value: ", raw , " = %.2f" % volts , " V"
+        # Sleep for 2.5 s
+        sleep(2.5)
 
-    # Sleep for 2.5 s
-    sleep(2.5)
+if __name__ == '__main__':
+    main()