Improve readme for #482
fixed double-'the' in second paragraph of ######Third-Party Objects
changed word order from 'the about' to 'about the' in the last line of #### Disposing View Hierarchies
Fixes #451 -- makes clear that Mongo server must be started.
Merge branch 'gh-pages' of https://github.com/dschwertfeger/backbone-fundamentals into gh-pages

Added fixes from David Schwertfeger
Merge branch 'gh-pages' of https://github.com/colemanfoley/backbone-fundamentals into gh-pages

Added changes from Coleman Foley