Note about unit test code coverage.

steve-cmb:go-slab steveyen$ ~/go/bin/gocov test | ~/go/bin/gocov report
ok         github.com/couchbaselabs/go-slab                                0.027s

github.com/couchbaselabs/go-slab/slab.go slabClass.addSlab                 100.00% (13/13)
github.com/couchbaselabs/go-slab/slab.go slabArena.bufContainer            100.00% (12/12)
github.com/couchbaselabs/go-slab/slab.go slabArena.findSlabClassIndex      100.00% (9/9)
github.com/couchbaselabs/go-slab/slab.go slabClass.popFreeChunk            100.00% (9/9)
github.com/couchbaselabs/go-slab/slab.go slabArena.DecRef                  100.00% (6/6)
github.com/couchbaselabs/go-slab/slab.go slabArena.AddRef                  100.00% (4/4)
github.com/couchbaselabs/go-slab/slab.go slabClass.chunkMem                100.00% (4/4)
github.com/couchbaselabs/go-slab/slab.go slabClass.pushFreeChunk           100.00% (4/4)
github.com/couchbaselabs/go-slab/slab.go slabArena.allocSlabClassChunkMem  100.00% (4/4)
github.com/couchbaselabs/go-slab/sync.go synchronizedArena.DecRef          100.00% (3/3)
github.com/couchbaselabs/go-slab/slab.go NewSlabArena                      100.00% (3/3)
github.com/couchbaselabs/go-slab/slab.go slabArena.Alloc                   100.00% (3/3)
github.com/couchbaselabs/go-slab/slab.go slabClass.chunk                   100.00% (3/3)
github.com/couchbaselabs/go-slab/sync.go synchronizedArena.Alloc           100.00% (3/3)
github.com/couchbaselabs/go-slab/sync.go synchronizedArena.AddRef          100.00% (3/3)
github.com/couchbaselabs/go-slab/sync.go SynchronizedArena                 100.00% (1/1)
github.com/couchbaselabs/go-slab/slab.go chunkLoc.isEmpty                  100.00% (1/1)
github.com/couchbaselabs/go-slab/slab.go slabArena.makeSlabClass           100.00% (1/1)
github.com/couchbaselabs/go-slab/slab.go slabArena.addSlabClass            100.00% (1/1)
github.com/couchbaselabs/go-slab          -------------------------------- 100.00% (87/87)

steve-cmb:go-slab steveyen$ git describe --long
0.0.0-0-gecfea2f