Just include necessary files in bundle

[SimenB]

Before:

-rw-r--r--    1 simbekkh  1503010931    27B Aug 31  2016 .eslintrc
-rw-r--r--    1 simbekkh  1503010931    45B Aug 31  2016 .npmignore
-rw-r--r--    1 simbekkh  1503010931   205B Aug 31  2016 .travis.yml
-rw-r--r--    1 simbekkh  1503010931   2.9K Mar 10 15:35 CHANGELOG.md
-rw-r--r--    1 simbekkh  1503010931   1.1K Aug 31  2016 LICENSE
-rw-r--r--    1 simbekkh  1503010931   2.9K Aug 31  2016 README.md
-rw-r--r--    1 simbekkh  1503010931   995B Aug 31  2016 capture.template.js
-rw-r--r--    1 simbekkh  1503010931   1.0K Aug 31  2016 gruntfile.js
-rw-r--r--    1 simbekkh  1503010931   3.5K Mar 10 15:33 index.js
-rw-r--r--    1 simbekkh  1503010931   1.7K Aug 31  2016 karma.conf.js
-rw-r--r--    1 simbekkh  1503010931   2.2K Mar 10 15:35 package.json
drwxr-xr-x    3 simbekkh  1503010931   102B Apr 10 12:31 test
-rw-r--r--    1 simbekkh  1503010931    97K Mar 10 09:52 yarn.lock

After:

-rw-r--r--  1 1115076382  1503010931 2239 Apr 21 09:49 package/package.json
-rw-r--r--  1 1115076382  1503010931 2959 Apr 21 09:04 package/README.md
-rw-r--r--  1 1115076382  1503010931 1077 Apr 21 09:04 package/LICENSE
-rw-r--r--  1 1115076382  1503010931 3539 Apr 21 09:47 package/index.js
-rw-r--r--  1 1115076382  1503010931 2989 Apr 21 09:04 package/CHANGELOG.md