Merge pull request #20 from vishalsodani/master

Fix typo and re-write a sentence
Fixing a small typo in chapter 1's text.
Merge pull request #21 from jbranchaud/chapter1_typo

Fixing a small typo in chapter 1's text.
Merge remote-tracking branch 'upstream/master'
Merge pull request #22 from vishalsodani/master

Re-write couple of sentences
Fixed Corange Link
Removed brogrammer link
Merge remote-tracking branch 'upstream/master'
Improve a sentence