fixed typos in code comments.
tab to blank space conversion. indentation fixes.
improved docblock for method getSimplifiedSessionsForCourse()
freed up result set post-processing. death to array_push. renamed result set variable to $query to align it better with the codeigniter default naming conventions.
added docblock to method getSILM().
freed query result post-processing, renamed query result variable JAJAJAJA.
added meaningful docblock to method getSILMBySessionId() and cleaned up implementation.
Merge pull request #272 from stopfstedt/master

code cleanup in "session" model.