fix: use main lodash instead of lodash.throttle to make webpack bundles smaller

[jedwards1211]

fix #55

I also added babel-plugin-lodash so that there's low risk of anyone
importing additional lodash methods in an inefficient way in the future.
But if you want me to remove this and just use import throttle from 'lodash/throttle'
instead, let me know.

[coveralls]

Coverage remained the same at 96.907% when pulling c8fd33f on jedwards1211:main-lodash into f4724fb on fkhadra:master.