log out work
Merge pull request #11 from ahsterling/tools

Tools
Merge branch 'master' into steph
log out logic finished
Merge pull request #12 from ahsterling/steph

Steph
passes rspec update tool test
Merge branch 'master' into tools
passes tool update test
assigns user id when tool is checked out
passes test for changing status from out to in
passes tests for returning tool
refactors button_to reserve to send hidden value of status
adds button to return tool for tools checked out to current user