Typo fixes and clarification for MapReduce
Merge pull request #24 from dandv/master

Typo fixes and clarification for MapReduce
Add graphics dependency.

Seems strange because Arch built it fine, but Ubuntu doesn’t.
Extend readme file to provide more instructions.
Merge pull request #25 from ming13/fix-books-building

Fix books building
Remove TeX line from Markdown source.
Merge pull request #26 from ming13/remove-tex-line

Remove TeX line from Markdown source.
Improve MapReduce example

This new version hand-holds MapReduce neophytes (like myself) by
completely walking through a counterexample.
map reduce improvements
Trivial typo fix: imput -> input
Merge pull request #29 from meonkeys/master

Fix typo: imput -> input
Improve readability of MapReduce closing words
Merge pull request #30 from meonkeys/master

A more readable paragraph for the MapReduce chapter
Changes a few words to code.
Wraps code lines which are longer than 50 characters because characters after the ~50. character are not shown by Sony PRS-650 (epub).
Merge pull request #31 from palacsint/master

formatting
Merge branch 'master' of git://github.com/karlseguin/the-little-mongodb-book