Add `sentry-xmpp` to list of plugins
Add limit_request_line to the config template.

This is needed because all of SENTRY_WEB_OPTIONS from sentry/conf/server.py
gets clobbered by the config generated here.
Merge pull request #1039 from russelldavis/config-fix

Add limit_request_line to the config template.
Merge pull request #1016 from chroto/sentry-xmpp

Add `sentry-xmpp` to list of plugins
Implement search backend abstraction
Add fake search migrations
Simplify exception for 404 on request handler
Remove group-related fields
Basic error extraction
Pass response to _extract_error
Gracefully handle missing content-type header
Do not imply commit by default
sanitization for solr values
iterkesys -> iterkeys
Correct inverted content-type check
Simple update test for SolrClient
Maintain unicode on strings
remove invalid comments
Encode body to utf-8
Change header link to block style (fixes blank margin)