Merge pull request #120 from mitchmindtree/master

Improved trait implementation macros. Implemented positioning helper methods. Updated readme.
Implement Decodable for Color. Closes #59.
Implement Encodable for Color. Closes #58.
Merge PistonDevelopers/conrod
Fix compiler errors after merge.
fix graphics dependency change (rust-graphics -> graphics)
Merge pull request #124 from eklavya/master

fix graphics dependency change (rust-graphics -> graphics)
Merge pull request #122 from cybergeek94/master

Implement `Encodable, Decodable` for `Color`.
Switched label and widget_matrix over to the builder pattern (see all_widgets example)