Valloric / ycmd / 1895

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Auto merge of #467 - micbou:check-core, r=Valloric

[READY] Add checks to ycm_core library when starting ycmd

Do the following checks on the ycm_core library when starting ycmd:
 - missing library;
 - compiled with Python 2 but imported with Python 3;
 - compiled with Python 3 but imported with Python 2;
 - outdated library.

When one of these errors is encountered, exit with a non-zero status code specific to the error. These status codes will be used in the YCM client to display an appropriate error message to the user. In addition, starting a separate process to check the core version will not be needed anymore. This should slighty improve the Vim startup time. See issue Valloric/YouCompleteMe#2085.

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