Implement missing tests

How embarrasing…
Add error level for informational annotations
Use note level messages where applicable
Merge branch 'master' into feature/info-level

* master: (49 commits)
  Use standard display-buffer [#261]
  Parse optional column information from go-build [#259]
  Improve error testing
  Use test-local process environment
  Update changelog and credits
  Document temporary-file-name in the manual
  Improve temp file name generation
  Write Go output to temporary file
  Test go with GOPATH set
  Simplify version info retrieval
  Remove dead test cases
  Update the changelog
  Fix headling in changelog
  get rid of Enhanced-Ruby-Mode
  Remove obsolete checker declaration macro
  [Fix #257] Close defface sexp
  Support alternative ruby modes
  Remove -property option from D checker
  [Fix #251] Handle abbreviated file names from luac
  Clarify licensing in HTML manual
  ...

Conflicts:
	doc/flycheck.texi
	flycheck.el
	test/builtin-checkers-test.el
Update Clang tests

Following 629773c
Fix test for info level
Merge pull request #215 from flycheck/feature/info-level

Add info error level