Latex filter: Added support for generating SVG images

It is now possible to choose to generate SVG images instead of PNG
images in the Latex filter. SVG is a scalable format which look good
both in print and on the web. This makes it easier to separate content
from presentation.
Renamed latex2png.py to latex2img.py

The latex2png.py script have now been renamed to latex2img.py since it
can now generate both PNG and SVG image formats.
Latex filter improvments

The Latex filter SVG rendering have been slightly improved by adding the
--exact command line argument to the dvisvgm command. Previously,
characters near the image bounding box could be clipped.

The dvisvgm --scale was increased to 1.4 so that the font size better
match normal font size for text.

The Latex filter documentation have been updated to include information
about the SVG image format.
Updated references to the Latex filter

A couple of references to the Latex filter in the documentation was
updated to be image format neutral since the Latex filter now support
both PNG and SVG image generation.
Adding examples for the asciidoc man page
Adding a SEE ALSO section to the man pages
Merge branch 'filter-latex-svg' of https://github.com/sm0svx/asciidoc into sm0svx-filter-latex-svg
Merge pull request #8 from aerostitch/add_example_manpage

Adding examples for the asciidoc man page
Using encoding for write_file to fix --icon issue as per this link:

https://lists.fedoraproject.org/pipermail/scm-commits/Week-of-Mon-20131202/1153359.html
Merge pull request #12 from jgoalby/master

Using encoding for write_file to fix --icon issue as per this link:
Apêndice only has has one "p"

As you can see at: http://www.priberam.pt/dlpo/ap%C3%AAndice
Bug with bibliography example in documentation

As pointed by matt at: https://groups.google.com/forum/?fromgroups=#!topic/asciidoc/Toebf1FFYd0

I tested and it's there:

$ cat bibtest.txt 
== Text

Some text.

[bibliography]
.Optional list title
- [[[taoup]]] Eric Steven Raymond. 'The Art of UNIX
  Programming'. Addison-Wesley. ISBN 0-13-142901-9.
- [[[walsh-muellner]]] Norman Walsh & Leonard Muellner.
  'DocBook - The Definitive Guide'. O'Reilly & Associates.
  1999. ISBN 1-56592-580-7.

$ asciidoc bibtest.txt 
asciidoc: WARNING: bibtest.txt: line 11: list item index: expected 1 got 1999
Merge pull request #14 from edusantana/master

Bug with bibliography example in documentation
Merge pull request #13 from edusantana/patch-1

Apêndice only has has one "p": PT-BR translation
Added basic MathJax support and augmented user guide accordingly.
Merge pull request #24 from jghub/mathjax

Added basic MathJax support and augmented user guide accordingly.
Add support for Travis-CI
Return error code 1 when asciidocapi.py doctest fails
apt-get install needs root privileges
Update texlive for Travis-CI on Ubuntu 12.04 LTS