Clarify the forth task arg

Make some clarification for the forth task argument in README.md.
Fixed typo in README.md
Merge pull request #153 from johnsetzer/master

Fixed typos in README.md
Merge pull request #154 from vmeurisse/fix-Filelist

Fix Filelist with directories containing /../
Fix archiveChangeDir for zip.
Change jake.exec('rm -fr') to jake.rmRf for cross-platform compat.
Merge pull request #156 from mbfgit/fixZip

Fix needZip PackageTask when using archiveChangeDir.
A little cleanup, comments on PackageTask
Version 0.3.15
Nicer output for TestTask
Version 0.3.16
Merge pull request #150 from wingy/patch-1

Clarify the forth task arg
Actually only task-name is required.
Allow opts passed before action
Use cloned FileList in PackageTask prereqs so it's correctly lazy
Issue #158, backslashes in FileList pattern
Version 0.3.17
Separate CLI invocation
Pass positional args instead of array
Minor version bump for embeddable Jake
Version 0.4.1