file_system.* added. Functions still need to be fleshed out.

git-svn-id: https://subversion.ews.illinois.edu/svn/sp14-ece391/_projects/group14/branches/file_system@15296 1cec0ab5-dbbe-4d55-bb2a-e14ca091d7d0
Update return conditions and functionality framework

git-svn-id: https://subversion.ews.illinois.edu/svn/sp14-ece391/_projects/group14/branches/file_system@15368 1cec0ab5-dbbe-4d55-bb2a-e14ca091d7d0
Clean function headers for file_sys.*

git-svn-id: https://subversion.ews.illinois.edu/svn/sp14-ece391/_projects/group14/branches/file_system@15375 1cec0ab5-dbbe-4d55-bb2a-e14ca091d7d0