cron 101: style update
cron 101: fields to table
cron 101: indent table
fixing indentations & long lines
careers: style edits, heading changes
sysadmin 101: headers & line spacings
Updated credits/contributions doc link
Apparently github doesn't handle relative links in README files per https://github.com/github/markup/issues/101
Merge pull request #50 from handyman5/contributions_link

Reference to "credits" file is broken
Update shell_tools_101.rst

Added cut and sort to the list of commands that should be discussed.
Merge pull request #52 from jordandm/patch-1

Update shell_tools_101.rst
Update shell_tools_101.rst

Include df, du, find, and ls in the list of commands for working with your system.
Update meta/contributions.rst

Added self to list of contributors.
Update meta/contributions.rst

Added my email (jdm@dea-mattson.com).
Merge pull request #1 from jordandm/patch-1

Update shell_tools_101.rst commands included to include cut, df, du, find, ls, and sort
Update shell_tools_101.rst

Fix formatting for sort section.
Update shell_tools_101.rst

Fix sort formatting.
Update shell_tools_101.rst
Update shell_tools_101.rst

Fix command heading formatting.
Merge pull request #53 from jordandm/master

Added self to contributors; various fixes.