make sure the buildstats always endup in the log file
add build_details module to group all code related to build details like
build stats, environment, ...
move build_stats code to build_details module; change the call API (cpu
details should not be passed)
cleanup variable names
minor cleanup of variables
log the commandline, pass it as build_options
pass command_line to get_build_stats
cleanup tests a bit
add kehoste (via git blame) as primary author
update 2014 copyright
fix copyright date back to 2013-2014
Merge pull request #824 from stdweird/add_go_args

Provide better build details