Don't set the limit() on ByteBuffers in EphemeralFileSystem.

Since we allocate new buffers when we are about to overstep capacity anyhow, there is no need to set a limit lower than capacity.
In fact doing so causes issues since we only check for capacity when we re-allocate.

Also renamed the clone() methods to copy() since the classes don't implement Cloneable.
Make EphemeralFileSystem keep track of directories.
Upgrade doctools to fix OSX issue.
Stop publishing docs on the embedded+webadmin combo.
Merge pull request #657 from systay/650

Fixes #650 - issue when doing multiple aggregation expressions on the same identifier
Using exceptions for error handling in store locker
Merge pull request #661 from lassewesth/storelockerrorhandling

Using exceptions for error handling in store locker
Merge pull request #656 from apcj/efs-directories

EphemeralFileSystem fixes and improvements.
Imports
Adding support for now('ms')
Changed now('ms') to timestamp()