Add demo flag to build examples

- Add `--demo`
- Add `perprof/examples/*.table` to the files copy during when
  installing perprof
- Update `README.md`
Fix xamples to examples
Correct pyyaml in REQUERIMENTS
Merge pull request #87 from abelsiqueira/master

Correct pyyaml in REQUERIMENTS
Update bash-completion
Update matplotlib backend

- Add all formats that matplotlib can export
- Add internacionalization support for matplotlib
- Add paper-background support

TODO

- Check PO files
- Fix background support

  Take a look in [this
  demo](http://matplotlib.org/examples/pylab_examples/color_demo.html)
  and in [this
  hack](http://stackoverflow.com/a/5181916/1802726).
Remove title for matplotlib

The title **must** be setup in the final document.

Close #86.
Fix the issue with --background for matplotlib
Update PT translation
Merge pull request #88 from abelsiqueira/bash-completion

Update bash-completion
Merge branch 'update-matplotlib'
Update make-examples
Implement black and white for matplotlib
Trim matplot figure
Page background sets plot background on matploblib

When only `--page-background` is set, the value of the plot background
will be the same.
Set transparent page when only plot color is chosen
Merge pull request #91 from abelsiqueira/make-examples-update

Update make-examples
Merge pull request #92 from abelsiqueira/mp-bw

Implement black and white for matplotlib
Merge pull request #93 from abelsiqueira/mp-trim

Trim matplot figure
Merge pull request #96 from abelsiqueira/plot-and-page-color

Page background sets plot background on matploblib