Update RedisWatcher Install.wixproj to be compatible with WiX Toolset v3.6 or greater

When trying to compile RedisWatcher with WiX Toolset v3.6 or greater, I run into this error:

__Description__: Unresolved reference to symbol 'WixComponentGroup:Product.Generated' in section 'Product:{3404A743-6802-41DD-A0BD-9229827FD2AF}'.
__File__: ~\redis\msvs\RedisWatcher\Install\Product.wxs
__Line__: 37
__Column__: 1
__Project__: Install

This pull request updates RedisWatcher to be compatible with WiX Toolset v3.6 or greater (tested wtih v3.8).

Got the solution from here: http://stackoverflow.com/a/12741595/3058685