First draft of file upload functionality

lib/fileUpload.coffee

+if Meteor.isServer
+  fileStore = new (FS.Store.GridFS)('files', {})
+  `Files = new FS.Collection('Files', {
+  stores: [fileStore],
+  filter: { allow: { contentTypes: ['image/*'] } }
+})`
+
+if Meteor.isClient
+  fileStore = new (FS.Store.GridFS)('files')
+  `Files = new FS.Collection('Files', {
+  stores: [fileStore],
+  filter: {
+    maxSize: 1048576,
+    allow: { contentTypes: ['image/*'] },
+    onInvalid: function (message) {
+      toastr.error(message);
+    }
+  }
+})`
+# Allow rules
+Files.allow
+  insert: ->
+    true
+  update: ->
+    false
+  download: ->
+    true
+  remove: ->
+    false
+
+Files.deny
+  insert: ->
+    false
+  update: ->
+    true
+  remove: ->
+    true
+  download: ->
+    false