use relative path for AMD

[holymonson]

webpack fails to resolve because . is not in the resolve path by default. This patch can fix it.

ERROR in ./~/blueimp-load-image/js/load-image-meta.js
Module not found: Error: Can't resolve 'load-image' in '/Users/monson/project/eleapp/node_modules/blueimp-load-image/js'
resolve 'load-image' in '/Users/monson/project/eleapp/node_modules/blueimp-load-image/js'
  Parsed request is a module
  using description file: /Users/monson/project/eleapp/node_modules/blueimp-load-image/package.json (relative path: ./js)
    Field 'browser' doesn't contain a valid alias configuration
  after using description file: /Users/monson/project/eleapp/node_modules/blueimp-load-image/package.json (relative path: ./js)
    resolve as module
      /Users/monson/project/eleapp/node_modules/node_modules doesn't exist or is not a directory
      /Users/monson/project/node_modules doesn't exist or is not a directory
      /Users/monson/node_modules doesn't exist or is not a directory
      /Users/node_modules doesn't exist or is not a directory
      /node_modules doesn't exist or is not a directory
      /Users/monson/project/eleapp/node_modules/blueimp-load-image/js/node_modules doesn't exist or is not a directory
      /Users/monson/project/eleapp/node_modules/blueimp-load-image/node_modules doesn't exist or is not a directory
      looking for modules in /Users/monson/project/eleapp/node_modules
        using description file: /Users/monson/project/eleapp/package.json (relative path: ./node_modules)
          Field 'browser' doesn't contain a valid alias configuration
        after using description file: /Users/monson/project/eleapp/package.json (relative path: ./node_modules)
          using description file: /Users/monson/project/eleapp/package.json (relative path: ./node_modules/load-image)
            as directory
              /Users/monson/project/eleapp/node_modules/load-image doesn't exist
            no extension
              Field 'browser' doesn't contain a valid alias configuration
              /Users/monson/project/eleapp/node_modules/load-image doesn't exist
            Field 'browser' doesn't contain a valid alias configuration
            /Users/monson/project/eleapp/node_modules/load-image doesn't exist
            .js
              Field 'browser' doesn't contain a valid alias configuration
              /Users/monson/project/eleapp/node_modules/load-image.js doesn't exist
            .jsx
              Field 'browser' doesn't contain a valid alias configuration
              /Users/monson/project/eleapp/node_modules/load-image.jsx doesn't exist
[/Users/monson/project/eleapp/node_modules/node_modules]
[/Users/monson/project/node_modules]
[/Users/monson/node_modules]
[/Users/node_modules]
[/node_modules]
[/Users/monson/project/eleapp/node_modules/blueimp-load-image/js/node_modules]
[/Users/monson/project/eleapp/node_modules/blueimp-load-image/node_modules]
[/Users/monson/project/eleapp/node_modules/load-image]
[/Users/monson/project/eleapp/node_modules/load-image]
[/Users/monson/project/eleapp/node_modules/load-image]
[/Users/monson/project/eleapp/node_modules/load-image.js]
[/Users/monson/project/eleapp/node_modules/load-image.jsx]
 @ ./~/blueimp-load-image/js/load-image-meta.js 22:8-39

[blueimp]

Unfortunately, RequireJS needs those relative paths, so I cannot accept those changes without breaking compatibility with RequireJS.