more coding style fixes.

doc: bumped version to 0.9.15; also stated that we work with nginx 1.…

…7.10.

updated the copyright years.

doc: bumped version to 0.9.13 and also claimed the compatibility with…

… nginx cores up to 1.7.7.

tests: suppressed a warning from the test scaffold for a timer test c…

…ase.

doc: bumped version to 0.9.12.

bumped internal code version to 0.9.12.

bugfix: init_worker_by_lua*: memory corruptions would happen when no …

…server {} is defined in nginx.conf. this regression had appeared in v0.9.11.

doc: bumped version to 0.9.11; also claimed that we work with nginx 1…

….7.4.

doc: bumped version to 0.9.10.