rename wiki syntax quick reference and detailed reference

- additional information -> context information
- outline "issue" instead of "link"
adjusting the help strings

give concrete examples and therefore enlarge the window size
refactors responses from members_controller#new to have less view in the controller
Refactors navigation toggler.
Fixes the toggler affecting the document height.

Toggling the menu would change scrollbar lengths. This fixes the problem
by subtracting top offset from new height.
Adds support for remembering the navigation toggle state.

This one uses sessionStorage to save navigation expansion state. Users
of some old IEs are out of luck ATM. An userData implementation could be
provided though, that would be great!
adds i18n-js gem providing us with easier access to translations in js
some cleanup of changeset css. once again, revisions are on the same level as history in issues/show
Being more defensive when trying to delete membership after last role was removed
add before filter in order for the authentication to work

corresponding tests can be found in chiliproject_tests plugin
add index for wiki_menu_items
force footer to the right corner at the bottom of the page
Merge branch 'feature/wiki_menu_auth_and_index'
increases robustness of menu item selection for wiki controller

* when the user is not allowed or no menu item exists for the page we just return nil
Merge pull request #73 from finnlabs/fix/wiki_controller_robustness

increases robustness of menu item selection for wiki controller
make open project theme default
delete chiliproject logos
replace chiliproject fav with openproject favicon
Merge branch 'refs/heads/feature/openproject-default-design' into feature/community_core_release
introduce new icon-set

* remove unused icons
* remove old chiliproject icons
* new iconset: http://www.webalys.com/design-interface-application-framework.php
* change css where needed
* restyle certain items
Conflicts:
	public/images/delete.png
	public/images/edit.png
	public/images/move.png