Fixed API keys not correctly reflecting scopes

Fixed counters in MySQL

Don't require SMTP keys to be set when backend doesn't require them

Apply mail.backend aliases before escalating into settings

Handle GroupTagKey and GroupTagValue when merging issues

Conflicts:
	src/sentry/tasks/merge.py
	tests/sentry/tasks/test_merge.py

ES6 classes in React don't autobind (fix saved searches)

Add documentation for new warnings

Support persistent dismissal of non-ephemeral alerts.

This reverts commit 6b8ad030, reversing
changes made to 928962d3.

Add an InvalidFrame marker in Stacktraces

Feature/short names as callsigns dummymigrate

Add `PreviewBackend` for mail testing.

To use, in your settings file:

    EMAIL_BACKEND = 'sentry.utils.email.PreviewBackend'

...or better yet, in your `config.yml`:

    mail.backend: sentry.utils.email.PreviewBackend

Guard against erroring on iteritems inside clean_local_cache

Fixes SENTRY-XW

Largest value = darkest color in tag distribution charts

Merge tag counts when merging groups

Rather than discard an entire stacktrace when there's one malformed
frame, opt to store an InvalidFrame instance.

Fixes GH-2808

Fixes for project list on dashboard

- Limit list of projects to membership
- Correct "all projects" link

Visual tweaks to event types

Fixes GH-2804

Support relaying internal errors to an upstream Sentry