Merge pull request #11 from Xercoy/master

Added one tip and a section on importing packages to tricks_and_tips.md.
minor improvements in copy of section 'Skills' of Chapter 1: 'Intro'
Merge pull request #12 from tapank/master

minor improvements in copy of section 'Skills' of Chapter 1: 'Intro'
removed an incomplete sentence
removed an incomplete sentence in section '2.2 Constants' chapter 2 'The Basics'
Merge branch 'master' of github.com:tapank/book
changed broken sec to cha x-refs in types.md

* atom editor added some return chars
Merge pull request #14 from nickmerwin/master

changed broken sec to cha x-refs in types.md
Merge pull request #13 from tapank/master

removed an incomplete sentence in section 'Constants' chapter 2 'The Basics'
Fixed link spacing, added info on importing packages to tricks_and_tips.md