* normally when exporting jpeg any pixel that was transparent
becomes black, make them white
* check for window.console.log before use (avoid crash)
* html2canvas.Parse: fix missing call to html2canvas.Util.Extend for the
given options
* read the version from version.txt
* set default target to build
* added dependencies to all targets
* allow the build to run without a local copy of the closure compiler
* updated license header with @VERSION@ which will be replaced during the build
* added the license header to all files (that one will be stripped out by the closure compiler)
