Adding e-mail notifications about mentions, follows, favourites and reblogs. Fixing another mention recording bug

of those to depend on presence of <thr:in-reply-to /> instead

[ci skip]

the block, even though the last line of a block is an implicit return. I am
confused to say the least

when registering incoming status mentions, add Travis CI file

local followers. Remote users' usernames SHOULD be case-sensitive

Access tokens no longer expire, case-insensitive local username validation, as well as case-insensitive Webfinger look-up