Add option to disable color on chisels and doc updates

This patch set:
* updates the docs to comply with the changes introduced in commits e0ddd9a and 5924185, discussed in Issue #147
* updates ansiterminal.lua to make disabling of colored output in chisels possible
* adds optional arguments in `echo_fds`, `proc_exec_time`, `spy_ip` and `spy_port` to disable colored output