bugfix: fixed all the warnings from the clang static analyzer.

allow use of the DDEBUG macro from the outside (via the "-D DDEBUG=1"…

… cc opton).

fixed an issue that prematurly removing a write event when still busi…

…ly connecting to the database from the event model.

introduced a TEST_NGINX_MYSQL_HOST variable in the test suite. now we…

… can test against a remote mysql directly (without a local tcp proxy).

updated docs and minor coding style fixes.

added more debugging outputs.

updated .gitignore.

enable --with-debug in developer build script again.

Merge branch 'master' into devel

Merge branch 'master' of github.com:chaoslawful/drizzle-nginx-module