Wiki pages for a community.
Merge branch 'wiki' of https://github.com/alxdarksage/Bridge into wiki

Conflicts:
	src/main/java/org/sagebionetworks/bridge/webapp/ClientUtils.java
	src/main/java/org/sagebionetworks/bridge/webapp/controllers/FileController.java
	src/main/java/org/sagebionetworks/bridge/webapp/controllers/communities/CommunityController.java
	src/main/java/org/sagebionetworks/bridge/webapp/controllers/communities/CommunityWikiController.java
	src/main/java/org/sagebionetworks/bridge/webapp/forms/WikiForm.java
	src/main/java/org/sagebionetworks/bridge/webapp/forms/WikiHeader.java
	src/main/resources/messages/messages.properties
	src/main/resources/messages/messages_eo.properties
	src/main/webapp/WEB-INF/jsp/communities/edit.jsp
	src/main/webapp/WEB-INF/jsp/communities/new.jsp
	src/main/webapp/WEB-INF/tags/community-wiki-edit.tag
	src/main/webapp/WEB-INF/tags/community.tag