aditional improvements

Fixed few next issues with driver, there is next bug fixed on x64 kernel, working 5Ghz support (depending on flag A_BAND_SUPPORT, original detection of 5Ghz capability was strange and didn't work for me) and mode monitor (channel switching) now works. 
Log verbosity is very reduced, normally there should be no logs from this driver in syslog, only if something gets really wrong. 
I added some description into README.md and merged linux-3.14 branch into master, because I cannot even compile original master and I think that working code should be in master.