Update build to use new clean method

xnt.build.tex provides a clean function that will clean up generated files of
pdflatex. (Notice, this version of Xnt is still in development at this time)
Ignore tex generated files
Update slide template

*   Use 'Berlin' Theme

*   Fix Project Sub-Title

*   Fix Title Slide to use more verbose syntax (for later reference)

*   Add "Overview" Slide
Add today's (2013-03-15) slides
Initial project / team page
Merge changes (simliar, if not same)

Conflicts:
	slides/build.py