Added detailed instructions for setting up a windows 7 machine ready to compile appjs with links to all downloads.
Fix for build error, applied fix from https://github.com/appjs/appjs/issues/231.
windows building fix for "warning C4530: C++ exception handler used, but unwind semantics are not enabled. Specify /EHsc"
Updated building docs with text on compiling for 64bit windows.
Changed appjs.org link to be appjs.com
Updated download links to use bintray.
Merge pull request #389 from sihorton/master

Update of readme to link to appjs.com and download from bintray
Merge remote-tracking branch 'upstream/master'