grunt: small improvements to gruntfile

docs: removing old svn-http file from docs

docs: moving svn http docs to vcs server management

svn-proxy: data migration for svn http settings

vcs: register repo_name as specialized middleware variables instead of relying on env variables. - use order of defined vcs.backends to detect middleware for handling requests

vcs: re-use repo config propagated to the middleware to extract push_ssl configuration

vcs: add translation of _REPO_ID into real repo name into more generic vcs middleware.

vcs: moved svn proxy settings into vcs related settings - vcs middleware now returns dummyHandler if not configured - propagate the per-repo vcs related configs into VCSMiddleware - moved the forms arround and group things into more logical blocks

vcs: added logging into VCS middlewares

vcs: call the Config repr properly, we show sections count not value count.