Add documentation for deploying new compiler versions

Author: ChadKillingsworth

deployments.md

@@ -0,0 +1,8 @@
+# Deploying Closure Compiler to NPM
+
+ 1. Update the compiler submodule pointer to the tagged release.
+ 2. Update the package version number in `package.json`. The major version should be equal to the compiler version
+    and the minor and patch numbers should be `0`. Example: 20160619.0.0.
+ 3. Commit the changes from steps 1 & 2 and tag the commit.
+ 4. Push the changes and tag. If the tests all pass, Travis-CI will automatically publish the new release to the
+   npm registry.