Introduced limits for search operations: sizeLimit and timeLimit

Two parameters, ‘sizeLimit’ and ‘timeLimit’ can now be specified in the
same map that holds sort information, wherever that map is allowed.
SizeLimit specifies the maximum number of entries to be returned,
TimeLimit specifies the maximum duration (in seconds) of the search
operation.
Merge pull request #29 from fmeschia/master

Introduced limits for search operations: sizeLimit and timeLimit
Fix, config, and tests for issue #27, which is the NPE when using a pool and an anonymous bind.
Changed version to 0.10.0.