js/Chart.min.js: Symlink to the minified 0.2 library

This may cause trouble for our friends on symlink-deprived filesystems
(I'm looking at you Microsoft).  You'll probably have to copy the
source file (dep/chart/Chart.min.js) over by hand.

Everyone will have to checkout the dep/chart submodule to get the link
target.

diff --git a/js/Chart.min.js b/js/Chart.min.js
new file mode 120000 (symlink)
index 0000000..ace9e83
--- /dev/null
+++ b/js/Chart.min.js
@@ -0,0 +1 @@
+../dep/chart/Chart.min.js
\ No newline at end of file