Fix potential DB dump encoding issue

[zpchavez]

Fix potential DB dump encoding issue

Currently GenerateInstallCommand creates files by using the > operator to redirect the output of mysqldump to a file. Doing so does not ensure that the file will have the desired encoding. We should instead use the option --result-file=filename.sql to ensure that the file has the correct encoding.

http://makandracards.com/makandra/595-dumping-and-importing-from-to-mysql-in-an-utf-8-safe-way
http://nathan.rambeck.org/blog/1-preventing-encoding-issues-mysqldump