fix windows build issue where grunt is not found in build-www task

remove quotes

remove grunt dependency and instead require grunt build to run before building installers
look for brackets/dist folder
resolve dist path to absolute path
Merge pull request #396 from adobe/jasonsanjose/fix-build-www-spawn

Do not spawn `grunt build` in brackets repository when building installers
update all path buffers to accept long UNC paths
only conditionally call GetFinalPathNameByHandleW(), which is unavailable on XP
Merge pull request #398 from adobe/bchin/issue-6197

Fix for Issue #6197- "Broke Compatibility with Windows XP in Sprint 35"
merging latest master changes and fixing conflicts
Merge pull request #397 from adobe/jeff/fix-5270

Update all path buffers to accept long UNC paths