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fixes #12
Fix race in ext.RandId

The *rand.Rand source was not protected against concurrent access.
Merge pull request #15 from vanackere/fix-race-randid

Fix race in ext.RandId
Fix for #18: TestNetHandler panics on Windows.
Add a benchmark for using runtime.Caller to get file and line number.
Merge pull request #19 from ChrisHines/master

Fix #18 and add line number benchmark
fix #16. sethandler on child no longer affects its parent
make sure parent handler affects child until sethandler is called on child
Merge branch 'master' into v2