Feature/examples: Added more comprehensive usage examples. Adding ability to use Twitter Futures and Scala Futures in parallel.
Merge pull request #60 from newzly/future/examples

Feature/examples: Added more comprehensive usage examples. Adding abilit...
Feature/0.4.0: In operators, static columns, query restrictions, Twitter Futures now first class citizens.
Merge pull request #65 from newzly/feature/0.4.0

Feature/0.4.0: In operators, static columns, query restrictions, Twitter...
Making the AbstractColumn private
Adding blocking contexts.
Merge branch 'develop' into gh-pages
Merging version 0.4.0 documentation.