Simpler invocation

[AndreaCrotti]

I think it would be great to avoid the need to manually generate the logs and then feed it into code-maat after..

After all the command that needs to be run is known and to find out what kind of repository is we just need to check for .git/.hg/.svn in the directory right?

I can probably give it a try and add something like "--auto $path" or "--repository-path $path" option that does the detection and parsing, what do you think?