Chapter2: Replace PathElement (deprecated) with Segment
Chapter2: Import scala.language.postfixOps
Chapter2: Remove unused import statement
Chapter2: Remove unused import statement
Chapter3: Remove unused import statement
Chapter3: Remove unused import statements
Chapter3: Import scala.language.postfixOps
Chapter3: Remove unused import statement
Chapter-futures: Bump sbt version to 0.13.1; Bump plugins.sbt versions; Fix GoTicksBuild
Chapter6: Replace PathElement (deprecated) with Segment
Chapter6: Import scala.language.postfixOps
Chapter6: Remove unused import statement
Chapter6: Remove unused import statement
Merge pull request #13 from dusank/improvements-and-fixes-by-dusank

Improvements and fixes by dusank