[RFE] Better params ergonomics

[Fryguy]

A typical command is currently:

AwesomeSpawn.run!("ls", :params => [:a, :l])

Most times, params are needed (because sanitizing them is the point of using AwesomeSpawn, otherwise you'd probably just use backticks). But that params key is clunky.

Additionally, the params key is not passed to AwesomeSpawn.build_command_line

AwesomeSpawn.build_command_line("ls", [:a, :l])
# => "ls -a -l"

As such, I propose we drop the params key altogether, and make it part of the "command" portion via Array or Hash. So, I could see one or all of

AwesomeSpawn.run!("ls" => [:a, :l])
AwesomeSpawn.run!(["ls", [:a, :l]])
AwesomeSpawn.run!("ls", [:a, :l])

I kind of like the first one, and the second one is just an associative array version of the first (i.e. it's the same as .to_a), so it's straightfoward to implement.

Then, we should make build_command_line have the exact same interface.

[chessbyte]

first variant looks very readable and intuitive