Fix #67 and fix compiler warnings.

Author: tdicola

.gitignore

@@ -28,3 +28,7 @@ nosetests.xml
 
 # Translations
 *.mo
+
+# Annoying MacOSX files.
+.DS_Store
+._.DS_Store

source/c_pwm.c

@@ -201,7 +201,7 @@ int pwm_start(const char *key, float duty, float freq, int polarity)
     }
 
     strncpy(new_pwm->key, key, KEYLEN);  /* can leave string unterminated */
-    new_pwm->key[KEYLEN+1] = '\0'; /* terminate string */
+    new_pwm->key[KEYLEN] = '\0'; /* terminate string */
     new_pwm->period_fd = period_fd;
     new_pwm->duty_fd = duty_fd;
     new_pwm->polarity_fd = polarity_fd;

source/py_adc.c

@@ -26,14 +26,17 @@ SOFTWARE.
 #include "common.h"
 #include "c_adc.h"
 
+// Cleanup function commented out because it is currently disabled and this
+// generates unused method warnings. See adc_methods[] definition further 
+// below for reason for disabling the cleanup function.
 // python function cleanup()
-static PyObject *py_cleanup(PyObject *self, PyObject *args)
-{
-    // unexport the ADC
-    adc_cleanup();
-
-    Py_RETURN_NONE;
-}
+//static PyObject *py_cleanup(PyObject *self, PyObject *args)
+//{
+//    // unexport the ADC
+//    adc_cleanup();
+//
+//    Py_RETURN_NONE;
+//}
 
 // python function setup()
 static PyObject *py_setup_adc(PyObject *self, PyObject *args)

source/py_gpio.c

@@ -33,7 +33,6 @@ SOFTWARE.
 #include "common.h"
 #include "event_gpio.h"
 
-static PyObject *bb_revision;
 static int gpio_warnings = 1;
 
 struct py_callback