added option to FastWriter which omits the trailing new line character
Merge pull request #33 from donmilham/master

added option to FastWriter which omits the trailing new line character
free does nothing if parameter equals NULL
snprintf already calculated the length
snprintf does return a signed integer

assert if returned value is neagtive
ws
clarify return value
Merge pull request #30 from mloy/redundant-strlen
fix README; ws