Refactor rewrite rules to be more restrictive

- allow robots.txt and maintenance.html directly
- allow direct access on public subfolder in all extensions
- allow access for favicon.png and favicon.ico in root and application
- allow access to whitelisted resource files under extensions
- allow access to whitelisted resource files in RDFauthor
- rewrite everything else to index.php
Add initial support for extension integration testing
apply coding standards to ResourceController
Add 'Go to Resource (external)' to properties view menu. fix #152.
Forward Erfurt
Add support for APC caching of extension configs
Add initial version of controller base class for services

- base class for extension that provide services and thus do not need the complete
  view overhead
Disable layout and rendering for service controllers
Fail gracefully when store is not available

- the linked data server plugin should not trigger OntoWiki store error, when store
  is not available (such that e.g. other extensions that do not need the store can
  still work)
Add 500 response code when setup is invalid or store not running

- defer store access in setup helper until it is really needed
update Zend download link
tell curl to follow redirect in Makefile
Add custom error document for 503
add module contexts
release v0.9.7-2
Merge remote-tracking branch 'origin/release/0.9.7' into develop
fix toggle button for new jquery version (#167)

Use prop instead of attr.
cleanup togglebutton changes
removed tabs
forward Erfurt submodule