VS2013 build working again:
 - Added ICU download and compile steps to bootstrap.sh.
 - Switched Qt to shared libraries and enabled ICU and Webkit.
 - Switched to shared MS CRT.
 - Disable C4244 and C4267 warnings since these are not picked up by GCC.
Merge pull request #167 from programmerTim/develop

VS2013 build working again: