changed gui to darker theme

(cherry pick from af302dcd0c3f38a99c04b14acbfa363b0712c69d)
Merge branch 'unity-4.3' of https://github.com/kungfubozo/monodevelop into unity-4.3

# By m k (10) and others
# Via m k (1) and mo ko (1)
* 'unity-4.3' of https://github.com/kungfubozo/monodevelop:
  fixed mac build error
  solution now work with debug-win32 and x86 config
  changed gui to darker theme
  project and code fix up to make this branch to work with local libs (instead of require user to install gtk and mono etc)
  added some pre build lib
  remove .user from .ignore
  tweaked (ie hack) to use .user to reference to local libs/dlls instead of using proper msbuild missing file from previous CL
  tweaked (ie hack) to use .user to reference to local libs/dlls instead of using proper msbuild
  added external lib portableGit v1.8.4
  added external lib monoLibraries v2.6
  added external lib gtkSharp v2.12
  Make fewer assumptions when centering windows.
  Dismiss completion window if caret moved past the current word. (fix case 560287)

Conflicts:
	main/src/core/MonoDevelop.Ide/MonoDevelop.Components.MainToolbar/MainToolbar.cs