Started delete functionality; added denullify utility function
Merge branch 'master' into delete-convo
Added convo deletion functionality
Deletion WIP
Fixed delete; address PR comments
More style fixes
Added invalid login message.
Changd wording of invalid login message.
Added home button to signup page.
Simplified invalid login message hiding logic.
Merge pull request #12 from psybuzz/addhomebutton

Add home button to sign up page
Merge pull request #11 from psybuzz/invalidlogin

Add invalid login message
Spacing style fixes
Merge pull request #10 from psybuzz/delete-convo

Functionality to delete conversations
Fixed merge conflict.