fix(verbosity): add some ouput for useminPrepare in non verbose mode

Follow the request from @XhmikosR in #476 in comment:
https://github.com/yeoman/grunt-usemin/issues/476\#issuecomment-61568464
Merge pull request #479 from stephanebachelier/log_useminprepare

fix(verbosity): add some ouput for useminPrepare in non verbose mode
Added filter-in and out description

A little definition of what are doing the 3rd and 4th element of the
patterns array
Merge pull request #485 from dvdvck/patch-1

Added filter-in and out description
fix(log): use grunt.log.wordlist
Merge pull request #488 from stephanebachelier/log_wordlist

fix(log): use grunt.log.wordlist