Fix removing request from metadata

Previous implementation was broken as there ware still some leftovers of
newdata variable mixed with new data variable approach. Made it simple and
working.
create _meta and _link for rqlinked packages

_meta needs to be as empty as possible and _link is just a plain link without any magic or
template
Merge pull request #26 from miska/master

Fix removing request from metadata
wrote my first test - for create_package_container
also test disable_build=True
support delete requests by adding empty container and wipe it
reapply bffaecb6e20ad2c70e0c4234665ce9f630b58ad8
Merge pull request #27 from coolo/issue_1499

implement #1499 and #1489
Merge remote-tracking branch 'upstream/master'
Replace Python 2.6 to 3.3