DiffEditor: Apply visualize whitespaces according to options

Change-Id: I5f7c57479d5342f5457159b14fb6afa087cb988f
Reviewed-by: Marcel Krems <m.krems@software-vision.eu>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Git - execute fetch asynchronously

Change-Id: Ic2243adaa36444099f834676186331927f3f4588
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Git - refactor executeGit and remove unnecessary args

Change-Id: Idf770a20db66191b4d7fe3a704d31bdce70505c5
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Git - execute push asynchronously

Change-Id: I0d5b0eaf562d30f34f01bcf344791a4ce766bdab
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>