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Interrupt functionality is exactly the same as with BCM lib

#213 fix. Seems to be okay when I tested. Hopefully no weird errors rise afterwards.

Fix for #217 GettingStarted enhancement.

maskIRQ: Fixed function to clear interrupt bits first.

Fix warning: C++11 requires a space between literal and identifier

This change fixes the following compiler warning I get when building
on Arduino IDE version 1.6.7

"/var/folders/sv/27zk61c9449f9wycpfhq9dmr0000gn/T/build68a338274e8c0af55d2a1e6113ec3df2.tmp/libraries/RF24/RF24.cpp.o"
/Users/flaviof/Documents/Arduino/libraries/RF24/RF24.cpp:559:17: warning: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wliteral-suffix]
   printf_P(PSTR("Data Rate\t = "PRIPSTR"\r\n"),pgm_read_word(&rf24_datarate_e_str_P[getDataRate()]));
                 ^
/Users/flaviof/Documents/Arduino/libraries/RF24/RF24.cpp:560:17: warning: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wliteral-suffix]
   printf_P(PSTR("Model\t\t = "PRIPSTR"\r\n"),pgm_read_word(&rf24_model_e_str_P[isPVariant()]));
                 ^
/Users/flaviof/Documents/Arduino/libraries/RF24/RF24.cpp:561:17: warning: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wliteral-suffix]
   printf_P(PSTR("CRC Length\t = "PRIPSTR"\r\n"),pgm_read_word(&rf24_crclength_e_str_P[getCRCLength()]));
                 ^
/Users/flaviof/Documents/Arduino/libraries/RF24/RF24.cpp:562:17: warning: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wliteral-suffix]
   printf_P(PSTR("PA Power\t = "PRIPSTR"\r\n"),  pgm_read_word(&rf24_pa_dbm_e_str_P[getPALevel()]));
                 ^

Fix GettingStarted sample

The GettingStarted sample is apparently intended to send a number from the transmitter
to the receiver and echo that same number back again, but the code wasn't outputting
the echoed number properly. Now it doesn, and the user can see that the same number was
sent and echoed back.

Signed-off-by: mz-fuzzy <mzfuzzy800@gmail.com>

Clean-up/fix of RF24 configuration examples in RPi/Python example.
Signed-off-by: mz-fuzzy <mzfuzzy800@gmail.com>

Ooops.. thanks to marceloaqno for spotting this.

- Update scanner examples to use channels 0-125
- Update documentation indicating channels 0-125 only
- Per datasheet radio only has 126 channels

RPI2 autodetection

- SPI_HAS_TRANSACTION define was not being picked up properly: add
define to RF24_arch_config.h
- Fix beginTransaction call using RF_SPI_SPEED instead of RF24_SPI_SPEED
- Change beginTransaction to use SPISettings object
-