Add ability to visualize images from a device
Add brew instructions
Merge pull request #23 from dstnbrkr/brew

Add homebrew instructions
Merged show{view,layer,image,imageref} into visualize.
Updated README for visualize.
Added an error message if visualize in invoked on unsupported class.
Removed BOOL casts.
Renamed a variable, fixed a typo.
Removed unnecessary parentheses.
Added error message if attempt to get image data returns nil.
Removed _showLocalImage and merged _showImage and _showRemoteImage.
Merge branch 'visualize' of github.com:antons/chisel into develop
Merge branch 'show-on-device' of github.com:antons/chisel into develop