Update README.md

Corrected typo: 
'LET OF SOME STEAM BENNETT' -> 'LET OFF SOME STEAM BENNET'
Update ArnoldParser.scala

Corrected spelling error:
"LET OF SOME STEAM BENNET" -> "LET OFF SOME STEAM BENNET"
Merge pull request #53 from vasiliybondarenko/master

Modulo operation was implemented (as it was described in #44 issue)
add link to ModuloOperator
Merge branch 'master' of https://github.com/navyjeff/ArnoldC
Merge branch 'master' of https://github.com/lhartikk/ArnoldC