Add sorting activities to the main page

[wojtekbu]

The parent ticket can be found here: #11
According to the mock https://user-images.githubusercontent.com/12927553/48443971-55f41d00-e758-11e8-96ad-6596c7a6092c.png add sorting functionality.

Default sort should be based on the number and age of updates of matching records in partners’ databases.

Sorting options:

• the number of updates,
• age of updates.

[johnhbenetech]

also see #18 for more info

[oskarhinc]

@wojtekbu I've verified it, and it's working well, but I've got some suggestions:

1. I think it should be available to determine if the sorting is ascending or descending, even as different dropdown options:
   -by xyz (ascending)
   -by xyz (descending)

2. The layout of the button could be quite different (it should not stick with the first activity on the bottom). Also for me, it's more intuitive for sort button to be floated right, but I'll leave it to you. It could also be in-line with "Recent ServiceNet activity" title.

3. I know it looks different than in the mock but I think it's a good solution to display the selected option all the time (like it's done for example on the amazon.com:
   

@johnhbenetech should we apply those suggestions?

[johnhbenetech]

As discussed in our Call:

• Design should be more in line with mock-up. Keep dropdown on same level as title and float right

• Sort Options should be:
  **Recently Updated
  **Recommended

• No need for ascending/descending option. Default should be newest to oldest, most to least.

Recommended sort at first will just be sorted by Number of Updated fields (most to least). In the future we will add weighting to fields updated, and weighting to updates over existing conflicts.

[oskarhinc]

The sorting looks as expected, but the Last updated date seems to be always now(). @wojtekbu do you know why it might be happening? If so, could you create a ticket for that?

[wojtekbu]

@oskarhinc It looks like conflicts cannot find a date for conflicted objects. Here is a solution #239