Move image-view to a package

This removes the ugliness of having project.coffee require
image-edit-session at the end since the image-edit-session can
now register itself in an @activate callback and as a deferred
deserializer in the package.cson file.

spec/app/image-view-spec.coffee

@@ -1,78 +0,0 @@
-ImageView = require 'image-view'
-ImageEditSession = require 'image-edit-session'
-
-describe "ImageView", ->
-  [view, path] = []
-
-  beforeEach ->
-    path = project.resolve('binary-file.png')
-    view = new ImageView()
-    view.attachToDom()
-    view.height(100)
-
-  it "displays the image for a path", ->
-    view.setModel(new ImageEditSession(path))
-    expect(view.image.attr('src')).toBe path
-
-  it "centers the image in the editor", ->
-    imageLoaded = false
-    view.image.load =>
-      imageLoaded = true
-    view.setModel(new ImageEditSession(path))
-
-    waitsFor ->
-      imageLoaded
-
-    runs ->
-      expect(view.image.width()).toBe 10
-      expect(view.image.height()).toBe 10
-      expect(view.image.css('left')).toBe "#{(view.width() - view.image.outerWidth()) / 2}px"
-      expect(view.image.css('top')).toBe "#{(view.height() - view.image.outerHeight()) / 2}px"
-
-  describe "image-view:zoom-in", ->
-    it "increases the image size by 10%", ->
-      imageLoaded = false
-      view.image.load =>
-        imageLoaded = true
-      view.setModel(new ImageEditSession(path))
-
-      waitsFor ->
-        imageLoaded
-
-      runs ->
-        view.trigger 'image-view:zoom-in'
-        expect(view.image.width()).toBe 11
-        expect(view.image.height()).toBe 11
-
-  describe "image-view:zoom-out", ->
-    it "decreases the image size by 10%", ->
-      imageLoaded = false
-      view.image.load =>
-        imageLoaded = true
-      view.setModel(new ImageEditSession(path))
-
-      waitsFor ->
-        imageLoaded
-
-      runs ->
-        view.trigger 'image-view:zoom-out'
-        expect(view.image.width()).toBe 9
-        expect(view.image.height()).toBe 9
-
-  describe "image-view:reset-zoom", ->
-    it "restores the image to the original size", ->
-      imageLoaded = false
-      view.image.load =>
-        imageLoaded = true
-      view.setModel(new ImageEditSession(path))
-
-      waitsFor ->
-        imageLoaded
-
-      runs ->
-        view.trigger 'image-view:zoom-in'
-        expect(view.image.width()).not.toBe 10
-        expect(view.image.height()).not.toBe 10
-        view.trigger 'image-view:reset-zoom'
-        expect(view.image.width()).toBe 10
-        expect(view.image.height()).toBe 10