Adapt to Gerrit 2.11.3 - Githubissues

Gerrit 2.11.3 release is imminent; probably the week-end of Aug 21-23. The plugin will need to be adapted. Refactorings needed:

change dependency to gerrit-api 2.11.3.
remove direct dependencies on parboiled in Gitblit code (some isolated and completely unnecessary instances).
check that markdown rendering still works (Gerrit 2.11.3 replaces parboiled by grappa 1.0.4). Should be compatible, but one never knows. If it doesn't work, re-include a relocated pegdown/parboiled combo in the shaded jar for use by Gitblit.
Gerrit 2.11.3 switches to Guice 4.0; we should be able to remove the FixedGuiceHttpServletRequest.

New release of this plugin should be ready at most a few days after Gerrit 2.11.3 has been released.

tomaswolf / gerrit-gitblit-plugin