Fix trivial code whitespace/quote issues

Signed-off-by: Ulrich Klauer <ulrich@chirlu.de>
Add --count option

Display how often a line occurred in the input if --count/-c is given.

Signed-off-by: Ulrich Klauer <ulrich@chirlu.de>
Add tests for --count

Signed-off-by: Ulrich Klauer <ulrich@chirlu.de>
Document that standard deviation is calculated

Signed-off-by: Ulrich Klauer <ulrich@chirlu.de>
Merge pull request #2 from uklauer/trivial

Some documentation and code whitespace fixes
Merge pull request #3 from uklauer/count

New option: --count
Add license comment.  Fixes #5 on github.com.

I hate boilerplate, but you can have one line :)

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>