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Was finally able to successfully recreate conditions to consistently
cause 'HARDWARE FAILURE RADIO NOT RESPONDING' messages on RPI master
node:
1: Using RPi B2.0 with Raspbian 4.1.20+ armv61
2. Using 2 matching nrf24l01 non-PA modules w/ext antenna
3. Using RF24Gateway + RF24Ethernet
4. Using Arduino Due as RF24Ethernet node

Test scenario: Mesh working normally for very long periods of time.
Re-introduced an old node using Arduino Due. Immediately started
noticing error msgs on master node.

Solution: Increasing the wait time from 85 to 95ms seems to prevent
false indications of hardware failures. It appears, the code was just
not waiting long enough.

First attempt to open   /sys/class/gpio/gpio<GPIO NUMBER>/direction
fails when running as non-root user. Added loop w/delay to retry for up
to 10 seconds by default.

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