Add global search functionality

[smilledge]

Added the global search function. It's made up of two parts;

1. Quick Search

• Allows the user to search for cards and boards from anywhere in cantas
• Displays results for the first 4 boards and 3 cards
• Pressing enter (or clicking the "View all results" button) while in the quick search view takes the user to the full results page

2. Search Results Page

• Full page view of all matching cards and boards
• Available via /search/{term}

Notes

• I have made a slight change to the styling of cards and boards, happy to change back if you don't like it
• Removed pagination using scroll, now uses a load more button (Less glitchy)

[smilledge]

Demo link is available at; http://test-cantas.rhcloud.com/

[dabeng]

Great user experience! the followings are my some advices:

1. you'd better append friendly tips if you just want to display partial results -- the first 4 boards and 3 cards
2. I think moving the 'view all results' button to the lower right corner will attract more attention
3. highlight colour is not apparent when cursor hovers boards or cards items
4. boards items is not easy enough to be clicked except user clicks the right section of the item.
5. last search results should be cleared when user clears the key words

[dabeng]

The closed boards and archived cards should be included in the global search results. Obviously, they should be listed in the result view in the form of disabled status.

[smilledge]

1. Results now show the number of displayed results are the total number of matches
2. Done.
3. Reverted cards back to the old style
4. Done.
5. Done.
6. Done.

[xiaods]

test pass in local environment.

[dabeng]

1. archived cards are not commented by tips like '(closed)' within closed boards
2. we direct user to the 'closed' boards tab page and highlight the according board if he clicks the closed board in the search results window.Similarly, 'Archived Cards' widow will pop up on user clicks the archived card in the research results as well as the card is highlighted

[smilledge]

1. They now have the same style as in the "My Cards" page.
2. Done. If a use clicks on a closed board or card in a closed board they are now redirected to the "Closed Boards" page and the bard is highlighted. If the click on an archived card they are taken to the parent board and the "Archived Cards" modal is opened with the card highlighted.

[dabeng]

I find a bug, the following is description:

1. search a archived card in the global search window
2. unarchive the card
3. re-input the same key words, I can't search the unarchived card until I refresh the page

[smilledge]

@dabeng Bug with archived cards is fixed.

[dabeng]

good job. I think this patch is ready for merge.