Merge pull request #66 from nmashton/master

Data Explorer tutorial post from @nmashton.
[config][s]: switch markdown from rdiscount to kramdown to get table of contents support.
[blog/new][m]: elasticsearch tutorial.
[join][s]: fix up html and make text simpler.
[blog][s]: small edit to latest data explorer post.
added robot
[post/new][m]: upload (old) post on GLA spending data and openspending.
[home][s]: tweak home page intro text.
[join][m]: redo top part quite a bit.
[projects/add][xs]: typo.
Remove .un~ file
[blog/new][s]: new open data maker night.
[events][s]: add open data maker night page.
[events][xs]: swap image on events page.
[blog][s]: tweak latest open data maker post.
Add aid transparency tracker blogpost
Merge pull request #78 from markbrough/master

[blog/new][m]: Add aid transparency tracker blogpost form @markbrough.
Merge pull request #77 from nmashton/master

[blog/new]: PublicBodies update from @nmashton.
[blog][xs]: fix "bug" in @markbrough's new post (: is not allowed in titles!).
[about][s]: add leads section.