* Consistent license message for all the go files
* Fixing the last set of unconsistencies with the license headers
* Addressing PR review comments
* Fixing busy.go and busy_test.go license header
* 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.
