Changed style of Settings button
Merge pull request #914 from Automattic/jetpack-home-link

Changed style of Settings button
Let's us core's time constants rather than raw

These have shipped since WP 3.5.  Magic numbers are harder to
understand at a glance.
Portfolios: Static functions are static.
Use an action, not plugin activation hook.

But leave the plugin activation hook there for legacy reasons.

Props @scotchfield
Fixes #904, #882
AtD: Alignment whitespace
AtD: Handle non-80 ports in proxy script.

Fixes #900
Props @danielnaber
Custom Content Types: fix mistake in error message
Breakpoint fix
Revert "Custom Content Types: fix mistake in error message"

This reverts commit ea7da186697b29ae04bd7ea3ce60a7d92dec0ac9.