Date filter bug fix

Date filter was not working properly on the Jetpack homepage.
Merge pull request #471 from Automattic/ui-tweaks-dave

Date filter bug fix
Merge pull request #472 from Automattic/ui-tweaks-dave

Ui tweaks dave
Change "Modules" nav link to "Settings"

- Changed “Modules” in navigation to “Settings”, which makes more sense
to me.
- Improved resolution of module icons, by changing font-size to 16px
Change "Modules" nav links to "Settings"

- Changed “Modules” in navigation to “Settings”
- Improved resolution of module icons, by changing font-size to 16px
Merge pull request #473 from Automattic/ui-tweaks-dave

Hide update nag, and fix filter on page load
Hide update nag, and fix filter on page load

- Exclude .update-nag from JP screens
- Filter modules by latest on page load, vs. only after you click the
filter button
Added some more padding to modules listing

- Increased module icons again
- Adding more padding to modules listing table rows
Merge pull request #475 from Automattic/ui-tweaks-dave

Added some more padding to modules listing
Updated intro message

The older message didn’t really fit any longer.  Added a link to the
settings page.
Merge pull request #479 from Automattic/ui-tweaks-dave

Updated intro message
Include link to Subscription email customization settings

As per #4367-wpcom; kudos to @jeherve for starting a patch, but it was
incomplete so I added more to it.
Merge pull request #483 from richardmtl/4367-wpcom

Include link to Subscription email customization settings
Correct how we're specifying the `wpcom_blog_id`.

I added this in 6ec05b51a740ab0e036db9ad5fcdcc42f68ab0e1 but didn’t
realize that `$args[‘blog_id’] was meant for local multisite installs,
not the wpcom blog id.
Added featured modules back into JP homepage

Featured modules section allows us to highlight some of the benefits of
Jetpack without jumping straight to a module listing.
Merge pull request #487 from Automattic/ui-tweaks-dave

Added featured modules back into JP homepage
Merge pull request #488 from Automattic/ui-tweaks-dave

Real-time module search
Real-time module search

No reason to force them to hit enter for the search to start filtering
results.
Fixed left nav & smoother mobile scrolling

- Made main wp-admin left nav fixed again
- Also resolved jerky scrolling in iOS

The one downside is that the little marker arrow in the “Jetpack” menu
item in the left nav is white which doesn’t look as good against the
green header area on the right.  It’s not too distracting though, and
is better than changing up the left nav so that it’s absolutely
positioned just on the JP admin pages.
Merge pull request #489 from Automattic/ui-tweaks-dave

Fixed left nav & smoother mobile scrolling