Example Flask integration

I have appended an example of a Flask integration.
Merge branch 'patch-1' of https://github.com/mjmare/bowerstatic into mjmare-patch-1

Modified the Flask documentation some more; I hope I got it right.

Extend and modify the integration documentation for Morepath and Pyramid
as well.

Conflicts:
	doc/integrating.rst
Merge branch 'mjmare-patch-1'
Describe documentation improvements.