Default paste language to user's last selected language

Closes #50.
Merge pull request #112 from programble/patch-1

Default paste language to user's last selected language
Update lib-noir dependency to 0.5.6
Allow editing and deleting of anonymous pastes

Fixes #72.
Factor out same-user? function
Factor same-user? out of show-paste-page-fragment
Transfer anonymous pastes to user on login

Closes #5.
Formatting
Merge pull request #113 from programble/patch-2

Anonymous paste editing, deletion and ownership transfer