Log excerpts should be properly escaped

[boosty]

Currently the live stream and the error list views don't escape html specials chars (such as < > &) in the log excerpt correctly.

Example log line:

Riak client error: #<SocketError: Unexpected EOF on PBC socket> for #<Riak::Client::Beefcake>

The live stream does not seem to escape it at all (which could cause XSS):

Riak client error: # for #

The error list view seems to double-escape it:

Riak client error: #<SocketError: Unexpected EOF on PBC socket> for #<Riak::Client::Beefcake>