* Fix assertion order
expected/actual were in wrong order, resulting in misleading output in
case of failing tests
* Merge consesutive markdown text nodes
This ensures that parser quirks such as "hello!" being parsed as
two separate nodes ("hello" and "!") are not exposed to code inspecting
a markdown strings.
* image proxy support
* go vet fix, remove mistakenly added coverage file
* fix test compile error
* add validation to config settings and documentation to model functions
* add message_source field to post
