fix #9: Adding a new html file to TODO MVC app deletes /apps/todo/components items on Windows

* fixed handling of relative paths (used for determining what to copy in the temporary staging location)
* upgraded fs-extra dependency - on Windows some single file syncs were performed with empty copied files (due to the copy function from fs-extra)
fix #11: Optimise META-INF creation for ad-hoc content packages

* createPackageMetaInf builds the META-INF based only on filtering rules
fix #10: Large content packages' archives are corrupted

* adm-zip is now only used for unzipping archives due to cthackers/adm-zip#65
* switched to archiver for creating zip archives