[WIP] Class added to style generic admonition like note.

[troublemagnet]

A new class called genericstyle has been added for styling generic admonitions. The styling is same as the styling for note. Please find the screenshots attached which show how an admonition looks like and how we can override the default styling.

Closes #98.

[troublemagnet]

@adammichaelwood This issue sphinx-doc/sphinx#3754 has the description of why the build fails. Turns out that switching to sphinx 1.5.6 is the solution.

[adammichaelwood]

The CSS work is great.

But this is the wrong approach for adding new styles. We don't need a new CSS file, which means we don't need to update conf.py or header.html

The new style class should be appended to the existing _static/css/custom.css (with a code comment explaining what it is, what it does, and referencing the issue number). No other changes should be required or included in this PR.

[adammichaelwood]

Also:

Is there a way to style the admonition without forcing the user to add a class to the markup? Are there any admonition-specific classes already present in the html output which can be used?

[troublemagnet]

@adammichaelwood I shall research more and will try to find out an alternative way to do it. Also I'll move it to custom.css.

[adammichaelwood]

Just look at the output in your browser dev tools. There's got to be something already there to hang the styles on.

[adammichaelwood]

Are you going to complete this PR?

[troublemagnet]

@adammichaelwood yes sir, I'm on it.

[troublemagnet]

I'll fix this locally and make a new PR ASAP.