Template upgrade

After some reflexion about template handling (#163), I wanted a way to have gulp templates more readable.

First, we discussed about an equivalent of https://github.com/SBoudrias/gruntfile-editor but it's really difficult to adapt the concept for a gulpfile.

I come up with a simple but (I hope) useful little evolution of our template where I remove blank lines from template sources which ables us to put all control statement at the beginning of the lines.

The goal is to have something more readable while keeping a standard template syntax and clean generated files.