I arrived here doing research on the RadioHead library while considering using it in a non-raspy project. BUT, I did notice on the central documentation page for RadioHead (http://www.airspayce.com/mikem/arduino/RadioHead/
) that it appears the radios you're using aren't compatible with the Pi?
In the "Platforms" section, it states that the Raspberry Pi is only compatible with the RH_NRF24 driver. Then scrolling back up to "Drivers" we see...
"RH_NRF24 Works with Nordic nRF24 based 2.4GHz radio modules, such as nRF24L01 and others. Also works with Hope-RF RFM73 and compatible devices (such as BK2423). nRF24L01 and RFM73 can interoperate with each other."
No mention of your RFM95W boards.
This is based on a very cursory look, so I'd certainly recommend doing some digging through the RadioHead docs yourself before making any decisions, but hopefully this gives you somewhere to look!