BFGMiner Linux installation for minergate.

1. Get source code from official repository https://github.com/luke-jr/bfgminer 
   ang checkout tag "bfgminer-3.10.0". 
2. Run autogen.sh and then configure it with opencl and scrypt algorythm support (options: --enable-opencl --enable-scrypt).
3. make
4. Set environment variable MG_BFGMINER_PATH to bfgminer binary path (for example 
   MG_BFGMINER_PATH=/home/john/bfgminer-dir/bfgminer) or add directory to PATH
   environment variable (for example PATH=/bin:/usr/bin:/usr/local/bin:/home/john/bfgminer-dir).
5. Start minergate application.

