Merge pull request #19 from spekary/SliceSet

Added SliceSet

Merge pull request #18 from spekary/nil

Processing nil receivers on Set types

Merge pull request #17 from spekary/ordered_clone

Fixing clone for ordered set

Merge pull request #16 from spekary/ordered_set

Added ordered set

Merge pull request #14 from spekary/iter

Iterators

Merge pull request #13 from spekary/order_fix

Bug fix on order of values and keys in slice maps.

Merge pull request #10 from spekary/nil_slice_map

Adding reasonable checks for a nil slice map

Merge pull request #9 from spekary/range_nil

Enabling ranging over a nil receiver

Merge pull request #8 from spekary/set

Adding set

Merge pull request #7 from spekary/gob_test

Adding gob test