Added /kameloso to .gitignore

We don't want to commit the built binary, which is stored in the
project root for now.
Tweak dub.json

Both build types were missing alwaysStackFrame, and release was also
missing noBoundsChecks.

Removed the --gc-sections flags in LDFLAGS; apparently the linker culls
something critical, causing an immediate segfault on application start.