Initial commit: README and .gitignore

Both files are very preliminary,
especially the README has to be developed from ground up.
Add empty files to force directory structure
Add GPL license file and preamble to input in new files
Add lied_voice_piano score block

A score block for voice/piano songs, along with defaults file
Add includes/stylesheets/fontset_Minion-pro.ily

A fontset to use Minion Pro as default font.
Somewhat incomplete (only items that were used for Fried songs)

TODO:
This stylesheet was developed along with LiedDefaultA4.ily
It has to be sorted out how that Defaults file can be made useful
without the (non-free) Minion font set.

I think we must
- generalize LiedDefaultA4 (and rename it)
- adjust font sizes there for the default font
- move the font size commands to the Minion fontset
  (or an adaptor file between the Layout and the font
     (think about this whole issue carefully))
Factor out a4-lied style sheet and Minion Pro references

Clean up the default-a4-lied_... stylesheet:
- default-a4-lied_base.ily is the basic stylesheet (derived from Fried edition)
- fontset_Minion-Pro.ily just switches fonts
- default-a4-lied_minion.ily uses minion and adjusts font-sizes
- default-a4-lied.ily uses default fonts (font-sizes TBD!)
Rename includes and library dirs with prefix

OLL (for openLilyLib) is prefixed to the dirs.
This is to make it explicit when including from a .ly file
(because '\include "includes/..." ' would be somewhat ambiguous)
Add lied_voice-piano template

In the examples/templates directory
we will provide templates that can a) be used 
b) serve as examples and 
c) (partly) serve as documentation for OLL
Add Manual: First outline
Update .gitignore:

Add most Lilypond, LaTeX, backup and binary files
Bump copyright message to 2013
Rename OLLLibrary to OLLib
Set up stylesheets/fontsets

Set up a distinct directory for fontset stylesheets.
Move fontset_Minion-Pro there
Set up subdirectories of stylesheets

style sheets should go into distinct subdirectories, because variants of style sheets can sum up to several files each.

Create subdir a4-lied and move existing files there
Remove some obsolete .forceDir files
Move .forceDir files into renamed OLLib folder
Sort out OLLexamples and OLLtemplates folders

Examples and templates now are in separate toplevel directories
Add README files for each folder
Move openLilyLib_Manual.tex to OLLib

In the context of redefining the purpose of openLilyLib (from the concrete LIlyPond library to a wider range of purposes including tutorials and other LilyPond resources) I restructure the documentation: OLLib.tex will become the documentation of the core library.
Estabilsh documentation/tutorials/plans.md