1.0.0

In this release, refactoring, small bug fixes and minor improvements.

The most noticeable change is internal and also some API breakage,
however functionally speaking everything should stay similar.

What changed:

• new internal API to make it easier to add new commands or new variants of commands
• speed up big query results (e.g. when there are many completion candidates)
• improve error reporting
• tasks can be run synchronously or asynchronously
• support for more than one unsaved buffers
• support new libclang versions
• travis-ci now runs clang-tidy on irony-server source files
• completion candidates can be filtered base on availability

API break on completion impacted at least the following project,
which also needs to be updated:

• company-irony
• irony-eldoc
• counsel-irony

Known broken APIs are:

• irony-completion-candidates-async: the async callback now takes the
  candidates as parameter

• irony-completion-at-point-async disappeared,
  it should be removed from irony-mode configuration:

  ;; remove this
  (define-key irony-mode-map [remap completion-at-point] 'irony-completion-at-point-async)
  

  The function is no longer needed because irony-completion-at-point now works
  like one would expect, it request the completion synchronously.
  If asynchronous completion is needed, it should be written manually,
  but this no longer releated to completion-at-point.