Add the LEMON graph library source to the repo

I'll likely be using it, so this just makes it easier to get to from
elsewhere. If I end up not using it then I can just delete it.

14 files changed, 2279 insertions, 0 deletions

diff --git a/lemon/doc/images/bipartite_matching.eps b/lemon/doc/images/bipartite_matching.eps
new file mode 100644
index 0000000..b5683cb
--- /dev/null
+++ b/lemon/doc/images/bipartite_matching.eps
@@ -0,0 +1,586 @@
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