Migrate to registry-backed Spago and modernize tooling (#25)

* Modernize formatting and JavaScript lint tooling

* Migrate Bower and Pulp configuration to registry-backed Spago

Update CHANGELOG.md

Update APIs (#20)

* Implement bindings for URL

* Add bindings to UrlSearchParams

* Update tests

* Make next release entry

Prepare v6.0.0 release (1st PS 0.15.0-compatible release) (#17)

* Update the bower dependencies

* Update the changelog

Prepare v5.0.0 release (#13)

* Update CI to build with the latest version of the compiler

* Update the bower repository URL to match the URL in the registry

* Upgrade bower dependencies

* Update the changelog

Merge pull request #8 from purescript-node/compiler/0.12

Compiler/0.12

Merge pull request #5 from anilanar/ps-0.11

update for purescript 0.11

Merge pull request #4 from purescript-node/bump

Prepare for 2.0 release

Merge pull request #3 from purescript-node/build

Add travis build & update readme