Added color aliases to alternate-xelatex.
Also added fontspec package to example to trigger xelatex.
Unified class files into a single file with options.
Use tikz to layout logo
Tidy up color names
Re-added logo PDF
... makes class more stand alone, even if pdflogo option is used.
Added backwards-compatibility class files
Old class files now call new version with options and output helpful
warning
Pdf copying optional
Eliminated side effects of setting footnote size.
Merge branch 'master' of github.com:vs-uulm/latexslides-uulm
Default title graphic.

It's boring, but at least there is no compiler error if no title graphic is set.
Fixes #10
Options for different faculty colors
Fixes #11
Option for title graphic license

Fixes #5
Also introduces better cropping for title graphic
README update
Rudimentary support for vs logo.
Placement could be improved still. Fixes #8
replaced iftex package, now using ifxelatex as suggested in #13
Merge branch 'ifxetext-only'
More sensible gitignore.
New logo rendering

PGF commands instead of TikZ for rendering UUlm logo improve compilation time by 50 percent.
Create parent directories on install

Adds a `-p` Option to `mkdir` in `install.sh`.

Background

For me, none of the proposed folders contained a `latex` folder.
Thus, creating a `$PACKAGE_NAME` directory there and consequently
`copy_files` failed.
Merge pull request #14 from sschober/master

Create parent directories on install