RavenDB-1304 Storing keys with length > 127 in esent store throws ConcurrencyException

Requires: Storage schema update. Should be pretty fast, though, we just create an internal storage index.
RavenDB-1553 Add dangerous url to config
RavenDB-1553 Add dangerous url to config (DefaultConfigs)
Merge branch 'RavenDB_1553' of https://github.com/ml054/ravendb
Fixing test
Merge branch 'master' of github.com:ayende/ravendb