Fix usage of tilde for Matlab versions earlier than R2009b
Drop typecasting workaround for Matlab versions earlier than 7.1
Add note about minimum supported version of MATLAB in the documentation
Add version note to the developers MATLAB page
Also capitalize MATLAB in the developers documentation page
Merge pull request #688 from sbesson/matlab_versioncheck

Fix bfGetReader for MATLAB R2009a and earlier