Albert v0.9.1 released

This release was intended to contain only fixes. However there are some minor nifty changes recognizable by the user.

• Although not planned to be made official you can scan your files by typing albert scan files. Note that this feature may disappear someday.
• You can choose the terminal command in the settings dialog. The list shows all installed terminals. If you like you can provide a custom command.
• The app icon now uses a theme icon.
• Items of the files extension have now an “Open terminal here” action.

Check the git log for details.