Use low level console.print() method in boot.js
Use low level console.print() method in boot.js

While bootstrapping, the console object is not yet replaced by the
tabris module. Do not rely on the `console.error()` method in the
bootstrap code. Use the native console.print() method instead.

With this change, the native platforms don't need to implement
console.debug(), .log(), info(), .warn(), and .error() anymore.

Change-Id: Ia17a4f72c1aad6124fa741b712a3970b070013f3

eclipsesource/tabris-js,eclipsesource/tabris-js,eclipsesource/tabris-js