Added uglify.sh script to create jspdf.min.js using UglifyJS, fixes #161
Replaced async.js by a submodule pointing to its origin repo
Updated uglify.sh to work around async submodule
New dist files using updated async.js (IE10 compatibility changes)
Merge pull request #174 from diegocr/master

Added uglify.sh script to create jspdf.min.js using UglifyJS, fixes #161