Update README.md

fixed typo on line 529 node-statum-pool to node-stratum-pool
Merge pull request #288 from jonnycsolo/master

Update README.md
Update README.md
Valid json to Readme example coin conf
Merge pull request #296 from lhartikk/master

Valid json to Readme example coin conf
Minor readme change
Marked emark as POS type coin since auto detection fails