Search features

[milmazz]

Search improvements:

• provide a message to the user when there are no results at all
• Ensure the ESC key cleans the input element
• Let's change the URL once you search and ensure it can be sent around. Note it may not work on the file protocol though, so we need to check for window.history
• Let's ensure the back button works with search (depends on the item above)

[dignifiedquire]

Search url and history support turns out to be much more complicated, I'm afraid we will have to delay that.

cc @josevalim

[josevalim]

No problem. Let's have that pos 0.9. :D

[dignifiedquire]

Closing this then in favor of #341 as the rest I've just fixed