closes #93

add symlinks download
fix batch download after datamodel refactoring

add copy option to bootstrap
add dependencies to requirements

also db initialization has been moved before other imports, so that not
it is possible to load collections in Storages

when project permissions get updated propagate them to sessions and
acquisitions

bugfixing
adding root checkbox to debug app

define is_true and has on base.RequestHandler
fix test_collection.py

use tempdir custom module instead of tempfile
fail with 400 when ObjectIds are not valid
check existing schemas against a list at startup
add json schema draft 4 specification
give a more detailed error message for keys mismatch
remove upload method in core.py = dependencies (util.upload_ticket +
json schema)
remove search call + method = schema

check keys in requests from schema

https://github.com/scitran/api/pull/47/files

add timestamps to files
do not cache container in the storage class

perm_checker is now a function that returns a decorator to allow more complex logic