Added feature+bug list, updated tester project

Defined feature list together with all known issues (features.md).
Added some chek variables in test/tester D project in order to validate current status.
Fixed some minor typos in Gdb.D/DGdbTool.cs.
Updated the dependecy rederence list, so it may be broken for Alex to build a repo version; nonetheless this needs further fix and coordination.

Signed-off-by: Ľudovít Lučenič <llucenic@gmail.com>
Merge branch 'master' of https://github.com/llucenic/MonoDevelop.Debugger.Gdb.D