Make image transformation async

We hijack stream with image data from browserify due to invalid decoded content.
add basic Makefile

Useful for building examples.
package.json: rearrange deps

Make jasmine a development dependency and browserify - a peer dependency. The
latter makes more sense as staticify is a plugin for browserify.
bump browserify to 2.29.0, relax version spec
package.json: fix browserify version requirement
Fix guardWrites not to mis end of stream.
Gardening
Merge pull request #2 from andreypopp/transform-image-async

Various improvements