Updated file-level doc comments
Added CompositeCommandApplication
Fixed execution of default commands in CompositeCommandApplication
Prepared class extraction into webmozart/gitty package
Implemented manpage and AsciiDoc support
Made descriptor options configurable in HelpCommand
Removed unused import
Fixed missing constructor call in HelpCommand
Fixed displaying the manual for the default command
Added symfony/process to dependencies
Moved code to Puli\Cli namespace
Decreased check interval of ProcessLauncher to react quicker after terminating a process