Various fixes

Various fixes.

• Fix code highlighting in Voting chapter.
• Change “router” to “route” in Pagination chapter.
• Removed mentions of Router.map() in Comments and Pagination chapters.
• Linking to Boostrap site in Adding Users chapter.

Iron Router 1.0 Update

Updating the book for Iron Router 1.0.

• Defining routes with new path-first syntax.
• Use subscriptions instead of onBeforeAction in posts controller.
• Use this.next() in onBeforeAction hook.
• Rename XyzPostsListController to XyzPostsController.