Make "service not found" message more descriptive

[ashtum]

Since it's common for users to forget to install the parser service, we might want to use a more descriptive error message here. Given that asio::resolver can produce the same exact message, users might mistakenly try to debug that part of their code.

[vinniefalco]

Well that's why we want a file and line number in the exception. Also, maybe the parser service should be installed automatically if it is not already there?