add charset=utf-8
Merge pull request #1 from ksauzz/fix-garble

add charset=utf-8
Update en/02-concepts.md

Spellcheck
Merge pull request #2 from terkhorn/patch-1

Update en/02-concepts.md
simple spelling and layout cleanups
Minor spelling  corrections.

Also changed "precommit" to "pre-commit" when necessary, for
consistency reasons.
Merge pull request #3 from ricardobcl/master

Minor spelling corrections
add more images
Merge branch 'master' of github.com:coderoshi/little_riak_book
rollback bookgen change
attempt at better pdf generation
seperate sidebars
fix up aside title
beta 3 editing, added a cover
added more images
clarify the extent of dw
tweak some text
add more images
New cover; Tweak some single quote issues
add some color