Irony Mode Versions Save

In this release:

• add diagnostic support (flycheck-irony)
• add JSON Compilation Database

In this release:

• Windows support
• improvements of irony-server process management

This release contains bug fix and performance improvements, important changes are:

• Improve completion performances
• Build fixes for irony-server on Mac OS X
• Update FindLibClang.cmake to support new release of Clang

Features in this release:

• completion
• initial compilation db support with .clang_complete

This is a snapshot of what used to be develop branch of irony-mode. In the next release almost everything has been rewritten. This release is just to keep a trace of this "unfinished" version.