[doc] Add detail to README

Add more detail to the installation instructions by listing what
Debian/Ubuntu packages would need to be installed to use the toolbox.
Recommend installing the package by pip. Fix the markup for the links
and make each command-line code be on its own line.
[sdist] Remove MANIFEST.in

Remove MANIFEST.in file because it is not needed by Setuptools.
[metadata] Remove history and todo files

The history can be viewed by looking at git log, and the todo text file
wasn't being used and instead use the GitHub issue tracker.
[travis] Install python-cvxopt when available

Add travis-ci command to install python-cvxopt ubuntu package when using
the python 2.7 with system site pakcages profile. Install cvxopt's
dependencies in all other cases because it needs to be compiled.

Conflicts:
	.travis.yml