Update tutorial.md

correct description of example 10 -> 1000
Merge pull request #83 from HughDevlin/patch-1

Update tutorial.md
Merge branch 'dev'
read.size renamed nrow for text, uniform for all formats with new defaults
reorganized formats in lists, covers changes in keyval.length
updated to reflect dropping of keyval.lenght option
eliminated repetition and expanded
ever more to the point
these are needed only with now abandoned serde
acknowledge community contrib
dead code
avro.jar factored out
assign in correct env
protect lists before building data frame
too much for stderr
workaround for the eval within serialize problem
connect the pieces
release candidate
rmr self-detect
win build from DC

tagged for release 3.0.0