Update 2013-04-02-Red-and-Green-Callbacks.md

Fixed two typos:  "it's" --> "its"

"it's" = "it is" or "it has"
Some typo fixes etc.
Merge pull request #12 from Agis-/patch-1

Some typo fixes etc.
Merge pull request #11 from llaisdy/patch-1

Update 2013-04-02-Red-and-Green-Callbacks.md
typo
Fixed some missing dots in examples and some remaining typos.
Merge pull request #13 from syl20bnr/master

Fixed some missing dots in examples and some remaining typos.
new blog entries
Update 2013-04-05-concurrent-and-parallel-programming.md

fixes typo
Merge pull request #14 from videlalvaro/patch-1

Update 2013-04-05-concurrent-and-parallel-programming.md
new blog post
new blob design and posting
added new post
add mssing js
Fix a typo and correct some links

Also add a link to @mojombo's presentation about how Github uses Erlang.
Merge pull request #15 from Agis-/patch-1

Fix a typo and correct some links
Some more fixes
Merge pull request #16 from Agis-/patch-1

Some more fixes
Update 2013-04-13-Read-me-on-a-mobile.md

I will bite - I am a sucker for a typo :)
Merge pull request #17 from ewansilver/master

Typo in your latest article.