Updated CommandGroupUsage to print each command's arguments when printing help page for a command group; Also changed the wording from 'the most commonly used' commands when it's actually showing all the commands
Added spaces between [ ] and other elements for better readability. Updated UsagePrinter to append a newline only when all brackets on that line have been closed.
Refactored CommandGroupUsage to factor out common command arguments/options and retweaked the overall display
Incremented version number
Merge pull request #1 from snowell/feature/betterGroupOutput

Feature/better group output