Mono-D v1.5.2 - Completion improvements, dub support fixes

[Alexander Bothe]

For those who don't know what Mono-D is:

It's a plug-in for XamarinStudio to give it D 
editing/building/debugging/project management support which 
features a large amount of features like semantic highlighting, 
code completion (now there even is a bit CTFE available for 
better mixin pre-compile time analysis available), standard code 
navigation stuff like goto declaration or looking up 
variable/symbol references in the currently edited file - or 
well, just take a look at some of the screenshots uploaded to the 
blog.