Make option "--inplace" for sed -i like file editing

[GoogleCodeExporter]

I like pyp but the easiest way to edit file in place with pyp I found was:
cat f | pyp "p.replace('e', 'R')" | sponge f

But it's complicated and sponge isn't standard program (moreutils is not even 
in standard openSUSE's repositories).

So I propose to add option -i --inplace AND/OR add -o --output option that 
handles in place editing correctly. 

Original issue reported on code.google.com by [email protected] on 27 May 2014 at 3:06