fix #22 : no longer read/write the entry "name" in .pack (remove duplication)
add test to check Uri behavior
use Uri to resolve urls (no longer need to define baseUrl and assetUrl)
update test (data, path, url) to reflect change in the url management (pack , imap, tmap)
optim: doesn't dump into json empty loadArguments and empty importArguments
adapt packgen to follow new layout (now it generate file into the directory : asset/_.pack)
+ refactor of packgen_tests (previous code fail to run test in sequences) so after lot of try, I change to 1 test that run the sequences of operations)
update packlist (to sdk and new layout of pack)
Merge pull request #25 from davidB/dev_packlayout

pack layout (and url resolution)