Maintain public API and update coding convention

This seeks to keep the public API in-tact while improving method names
within ace by keeping the old methods as wrappers around the new
better-named methods.

For example, document.insert() now simply calls document.insertText()
and warns the caller via a console.log() that they are using a
deprecated method.

I've also updated the coding style of my changes (where I noticed
discrepancies) to match the rest of Ace.