Update README.md

Noted that on Linux csh needs to be installed.
Update README.md

Mentioned that HDF5 based MAT files can't be read
add function for option checking (and values)
Add option checking for MScript, MFunction
combine MFunction definitions; avoid checking option validity for internal uses of MScript
Get message string from General if not defined for the current function
Merge branch 'mma-dev' of github.com:rsmenon/MATLink into develop
Verify that MATLAB was actually opened with OpenMATLAB[]
Merge branch 'mma-dev' of https://github.com/rsmenon/MATLink into data-repr-test-1