[BFG-dev] 3.1.1 release process

[Luke-Jr]

I've begun the 3.1.1 release process.
Source is uploaded to:
    http://luke.dashjr.org/programs/bitcoin/files/bfgminer/3.1.1/
Tags will be pushed after all my official builds succeed.

Summary:
- bitforce: Support for Little Single boards, and Jalapenos with 1.2 firmware.
- avalon: Support new overclocking speeds (325, 350 and 375).
- Fixed a bunch of bugs, including GPU mining and at least one stratum-related 
crash.
- Windows: Now compiled with debugging information and new backtrace.dll to 
print usable backtraces to stderr on crash.

Luke