Code review fixes:
- Replacing text messages following the right convention
- Changing command to "Cmd-Alt-B"
- Updating README

Fixing bug due to jquery auto complete bug:
- When searching for an empty string or just display Quick Open for
Bower and then press enter, the search failed due to an empty string,
an handled exception is raised and the promise for fetching the packages
is never resolved, so the "Loading Bower registry" messages remains in
the status bar for the eternity.
Code review fixes:
- Moving notifications to the status bar, in the information section.