Model: remove LSMM2 and add it to .gitignore

Most users will need to recompile the LSMM2 binary to make it
work with their local machine. Let's remove the binary from version
control so that users do not try to use the compiled binary from
@kallisons' machine.

Also add it to .gitignore, so that the compiled binary is not
suggested as a change.
Model: remove execute bit from text files

These files are not actually executable.
Merge pull request #1 from dhalperi/master

two minor fixes