Merge pull request #7 from starschema/to-review-2014-09-02-B

sample meta_data w/o pub-sub support and query_server implemented
Updated proto.
Updated proto.
align common lib with proto submodule logger changes
Added new getter to value_type + creating debug symbols at compile.
Merge pull request #8 from starschema/to-review-2014-09-03-logger

align common lib with proto submodule logger changes
Merge branch 'master' of https://github.com/starschema/virtdb-common
Updated proto submodule.
Merge pull request #9 from starschema/review-20140903

Added new getter to value_type + creating debug symbols at compile.
separate debug and release flags; add notifications in the clean target in common.mk to check if clean worsk properly
picking up diag.proto changes