v1.6.0

This incremental release fixes a few long-standing (typically benign) bugs, provides optimizations for go1.6, and reduces allocations for read-heavy transactions.

Along with these changes to the lmdb package, the lmdbsync package has been updated to use the standard context package (soon to be included in the standard library), and its tests have been improved so that they cover more functionality and may be run during continuous integration. The lmdb.Handler API has also been changed to follow best practices using context.Context.

See the Change Log for specific details about changes for the v1.6.0 release.