Added Lifted Scaml Support

Hi,

I've added a "Lifted Scaml" mode to scalate which allows one to use scaml as a template preprocessor for Lift. The details are in the README.md.

I've deprecated the old style of initialization in Boot.scala. It still works if you do it the old way, but since there are two modes now, I've added something that uses the pattern of many other modules.

I have also written an updated demo project that is mentioned in the README.md.