Add pyboard compatible test scripts

pyboard/sentence_test.py

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+# micropyGPS Sentence Test
+# When properly connected to working GPS module,
+# will print the names of the sentences it receives
+# If you are having issues receiving sentences, use UART_test.py to ensure
+# your UART is hooked up and configured correctly
+
+from pyb import UART
+from micropyGPS import MicropyGPS
+
+# Setup the connection to your GPS here
+# This example uses UART 3 with RX on pin Y10
+# Baudrate is 9600bps, with the standard 8 bits, 1 stop bit, no parity
+uart = UART(3, 9600)
+
+# Instatntiate the micropyGPS object
+my_gps = MicropyGPS()
+
+# Continuous Tests for characters available in the UART buffer, any characters are feed into the GPS
+# object. When enough char are feed to represent a whole, valid sentence, stat is set as the name of the
+# sentence and printed
+while True:
+    if uart.any():
+        stat = my_gps.update(chr(uart.readchar())) # Note the conversion to to chr, UART outputs ints normally
+        if stat:
+            print(stat)
+            stat = None

pyboard/uart_test.py

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+from pyb import UART
+from micropyGPS import MicropyGPS
+
+uart = UART(3, 9600)
+
+# Basic UART --> terminal printer, use to test your GPS module
+# while True:
+#     if uart.any():
+#         print(chr(uart.readchar()), end='')
+
+
+my_gps = MicropyGPS()
+
+sentence_count = 0
+while True:
+    if uart.any():
+        stat = my_gps.update(chr(uart.readchar()))
+        if stat:
+            print(stat)
+            stat = None
+            sentence_count += 1
+    if sentence_count == 300:
+        break;    
+
+
+print('Sentences Found:', my_gps.clean_sentences)
+print('Sentences Parsed:', my_gps.parsed_sentences)
+print('CRC_Fails:', my_gps.crc_fails)
+