untagged-643366c1803f43c08e36: Merge pull request #15 from kripod/patch-1

Remove inappropriate message from chapter 6

untagged-805d38ef0c6e359cfc06

Change quotation marks

untagged-1c118e6cb940b7bfabbc

Revert .travis.yml hierarchy change

untagged-b92bd0af2ac9d4ce60b7

Fix authentication key

untagged-67262a84bec406df1575

Add a dummy language for travis

untagged-552a6ad8f430a5f32ae6

Fix formatting in chapter 2