Issue 103 enable crawl output by default

Crawl overview plugin is now enabled by default #103 

Better version printing like this:
```
Version = 2.3-SNAPSHOT
Git commit id = 4f747fb3107070a6f09a5ad0f9ad95debacfcd23
Git describe = crawljax-2.2-153-g4f747fb-dirty
Build at 28.01.2013 @ 18:12:00 CET
```

GNU style options with a short and a long name like this:
```
usage: java -jar crawljax-cli-version.jar theUrl theOutputDir
   -b,--browser <arg>       browser type: firefox, chrome, ie, htmlunit. Default
                            is Firefox
   -d,--depth <arg>         crawl depth level. Default is 2
   -h,--help                print this message
   -o,--override            Override the output directory if non-empty
   -p,--parallel <arg>      Number of browsers to use for crawling. Default is 1
   -s,--maxstates <arg>     max number of states to crawl. Default is 0
                            (unlimited)
   -v,--version             print the version information and exit
```
 
Fixed some bugs.