promise support; removing dependencies for browser

.gitignore

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-node_modules/
+.nyc_output
+node_modules
+
+npm-debug.log

.travis.yml

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+sudo: false
+language: node_js
+node_js:
+  - "0.10"
+  - "0.11"
+  - "0.12"
+  - "4"
+  - "5"
+before_install:
+  - sh -e /etc/init.d/xvfb start
+env:
+  global:
+    - DISPLAY=:99.0
+  matrix:
+    - TEST_SUITE=unit:node
+matrix:
+  include:
+    - node_js: "4"
+      env: TEST_SUITE=lint
+    - node_js: "4"
+      env: TEST_SUITE=unit:browser
+script: npm run-script $TEST_SUITE

CONTRIBUTING.md

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+## Wanna Hack on shapeshift.io package?
+
+Awesome. First, this package uses [JavaScript Standard Style](https://github.com/feross/standard).
+
+[![js-standard-style](https://cdn.rawgit.com/feross/standard/master/badge.svg)](https://github.com/feross/standard)
+
+You'll want to setup two private keys ([WIF](https://en.bitcoin.it/wiki/Wallet_import_format)) so that you can actually test the shifting. Set these as environment
+variables. Make one for Bitcoin (BTC) and the other for Litecoin (LTC). You'll be using real funds. But don't worry,
+it's small amounts (a few pennies).
+
+```shell
+# shapeshift API testing
+export SS_BTC_WIF=K....
+export SS_LTC_WIF=T....
+```
+
+Then run the tests:
+
+```shell
+npm test
+```

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2015-2016 JP Richardson
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.