splited emphasis.js into several modules to have fine grained control with rules pragma

splited emphasis.js into several modules to have fine grained control with wikification rules eg: rules except bold ... This fixes #701

I did the following test.

* pulled latest master and did a `bld.sh`
** created a new "test" git repo using a copy of the `static` file folder
* checked out my feature branch
** `bld.sh`
** copy satic folder over to the test
** `git status in the static folder`
** no rendering diffs shown. 

So the rendering should be bit compatible