MODE-1943 Implemented peer-to-peer indexing, based on processing of remote internal events. This mechanism will be triggered whenever a repository is clustered and indexing is not configured in clustered mode.
MODE-1913 Removed the CMIS webapp from the EAP xml configuration file. The web application will still be packaged & distributed, but will not start together with the subsystem.
MODE-1949 Fixed property & child node validation when removing mixins.
Corrected compiler warnings and JavaDoc errors.
Merge branch 'MODE-1949' of git://github.com/hchiorean/modeshape into hchiorean-MODE-1949
MODE-1901 Added support for obtaining the query plan without executing the query

There is a new 'explain' method in the ModeShape public query API that returns the internal
query plan for a given statement and language. This same functionality
is also exposed in the JDBC driver (as a custom method) and the RESTful
API (v2).
MODE-1948 Fix resource adapter shutdown procedure.

The resource adapter used to make 2 instance and close one which wasn't used
anyway. The code has only one engine now, and it is shut down when the resource
adapter's stop() method is called.

Make sure to wait until the shutdown is complete. Since the RA's stop() method
can be called from a shutdown hook, new background threads will be forcibly
halted before their work completes. When the shutdown takes more than 30 seconds,
log the time out exception.

This commit also adds some extra debug logging to know when the shutdown method
gets called.
MODE-1948 Changed logging to be more consistent with ModeShape patterns
MODE-1948 Fix / clean up I18n.

Make error I18n texts better fit the code they're supposed to log about,
clean up unused messages copied from elsewhere.

Add dependency on common tests classes to get I18n sanity test working.
MODE-1948 Initialize engine when requested by connection classes.