Check for context.skip? on every iteration?
Added simple array writer (for easily testing what contexts are produced)
Merge branch 'array_writer' into skip_records
CommandLine, make -G Gemfile work again
mockreader use new marc feature to freeze for thread safety
command line, explicit --stdin arg, no longer read from stdin on no arg.

It was error prone, and with some readers you actually don't supply a file stream
trim whitespace
refactor MockReader json load
bump version
ThreadPool, take arguments passed to block much like Thread.new

I finally understand what this is for in Thread.new, after needing it.
bump version
Merge branch 'master' of http://github.com/jrochkind/traject into skip_records
Add tests for skip!