Add notice of obsolescence

Updated notes on compatibility

readme: add adns5050 to tested sensors, change note about avr

Minor updates to readme

Merge pull request #6 from finrod09/maccel-scaledowncurve+roundingcarry

undo inline math beautification because GH is picky

remove mac-specific instructions since mac is unsupported

reset rounding carry after timeout

wordlist expansion

change via limits to be more sensible for new curve

changelog and release history correction

spelling correction

inline math formula beautification

Update readme dates

Added instructions to turn off OS accel; corrected limit comments in maccel.c