adding bower manifest

[ff6347]

I think this could be a starter for adding p5.js to bower. Like requested in issue #371
I'm not sure if this is enough but worth a try.
To push it to the registry it only needs:

# if bower is not installed  
npm install -g bower
# then
bower register p5js https://github.com/lmccart/p5.js.git  

[ff6347]

Just a note. Bower looks at the latest tag not the current state in the repo. So every time a new version is released or patched the bower.json needs to be updated as well.

[lmccart]

great thanks! is there a grunt plugin that could update bower on package version update? otherwise I will try to remember to update but p5.js is already registered on a number of others I'm keeping track of, so if you see it missing a version feel free to run the update command.

[ff6347]

Yeah there is. grunt-update-json

I installed it to my fork and tested it. It works. But if I create a pull request p5.js will be changed to version 0.3.7 because I made some test with the bower usage and so on. Also I needed to create a tag for it.