build scripts fail within a path containing spaces;

If the main repository directory path contains a space, build scripts fail.
Fixed this issue by quoting commands which use a path.
added "" as a Title for the 'start' command;

According to http://ss64.com/nt/start.html,
it's recommended to always include a title with the 'start' command
(even if it's empty).  Also, without the "", GitEx would NOT start;
rather, a new command prompt instance would be started.
Merge pull request #1602 from bergerjac/build-scripts-tweaks

Build scripts tweaks