update readme; fix #51 and add test

[alexggordon]

fixes 51 by passing context to custom deserializers

[coveralls]

Coverage remained the same at 95.585% when pulling 5cc5b08 on issue51 into 5969581 on master.

[coveralls]

Coverage remained the same at 95.585% when pulling 83221e3 on issue51 into 5969581 on master.

[coveralls]

Coverage remained the same at 95.585% when pulling 5b90230 on issue51 into 5969581 on master.

[mweststrate]

@alexggordon sorry, currently on holiday, so didn't see the changes earlier! Just reviewed them and looking good.

I think I didn't give you publish rights on npm yet, can you share your npm user name, then I'll add you as maintainer and you will be able to publish new versions

[alexggordon]

@mweststrate glad they looked good!

my NPM username is alexggordon, and that would be great! Thanks!

[mweststrate]

Added you as owner to the repo. New releases can be published by running `./publish.js` (it is an ancient script I kept copying over from project to project, so feel free to replace it with something more sophisticated, like https://www.npmjs.com/package/np) Op do 3 aug. 2017 om 15:54 schreef Alex Gordon <notifications@github.com>:

…

@mweststrate <https://github.com/mweststrate> glad they looked good! my NPM username is alexggordon, and that would be great! Thanks! — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#52 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABvGhPPcl-FKSkGiHhBosGKTUEL-fLZjks5sUdEJgaJpZM4Olvux> .