Modified the way the command string is constructed for calling the text-based browsers (w3m, lynx, etc.).
Restored necessary quoting of file names.
Added variables W3M_OPTS, LYNX_OPTS for passing arguments to the selected text-based browser.
Include `-dump' into W3M_OPTS, LYNX_OPTS. adjusted `a2x' manpage to document the changes (also fixed a few typos).
Remove duplicate run of doctest.testmod
Add created .png to .gitignore
Adjust git clean command to clean all test data
Merge pull request #25 from florentx/with-travis

Add support for Travis-CI integration
Added Travis CI indicator to readme
Merge pull request #26 from jghub/a2xfix

Modified the way the command string is constructed for calling the text-browsers
Use standard sys.exit() instead of the fragile exit from site.py module
Merge pull request #29 from florentx/sys-exit

Use standard sys.exit() instead of the fragile exit from site.py module
Fix R install instructions
Stricter tests: exit code 1 on warnings too
Fix latex-filter on Python 2.6
Print all warnings for the tests
New 'messages' directive to acknowledge and discard a specific message in the tests
Use the '% messages' directive to discard current warnings
Declare the empty section [unfloat-blockmacro] on the docbook45 backend