Option to write stdout/stderr to specified file

[nsimakov]

Hello,

I have added an (-O) option to write stdout/stderr to specified file, for example:
ts -O out pwd
will write output to file out

I also remove autotools generated files as they can differ system to system,
just run autogen.sh first

Regards,
Nikolay

[justanhduc]

@nsimakov This feature is quite great. Do you mind porting this option to my fork here? Or if you are unavailable, may I use your code and add you to acknowledgement?