fixed issue #600: Wrong version string when building outside a git repository.
fixed issue #600: Wrong version string when building outside a git repository.

glebmish/appleseed,Aakash1312/appleseed,Biart95/appleseed,appleseedhq/appleseed,dictoon/appleseed,docwhite/appleseed,luisbarrancos/appleseed,aytekaman/appleseed,Biart95/appleseed,luisbarrancos/appleseed,aiivashchenko/appleseed,docwhite/appleseed,pjessesco/appleseed,dictoon/appleseed,docwhite/appleseed,appleseedhq/appleseed,gospodnetic/appleseed,est77/appleseed,est77/appleseed,aytekaman/appleseed,aiivashchenko/appleseed,Aakash1312/appleseed,gospodnetic/appleseed,est77/appleseed,luisbarrancos/appleseed,docwhite/appleseed,gospodnetic/appleseed,glebmish/appleseed,luisbarrancos/appleseed,glebmish/appleseed,aiivashchenko/appleseed,aytekaman/appleseed,Vertexwahn/appleseed,appleseedhq/appleseed,luisbarrancos/appleseed,dictoon/appleseed,est77/appleseed,Biart95/appleseed,est77/appleseed,Biart95/appleseed,aytekaman/appleseed,glebmish/appleseed,Vertexwahn/appleseed,Aakash1312/appleseed,aytekaman/appleseed,gospodnetic/appleseed,appleseedhq/appleseed,aiivashchenko/appleseed,pjessesco/appleseed,Vertexwahn/appleseed,pjessesco/appleseed,dictoon/appleseed,glebmish/appleseed,aiivashchenko/appleseed,Vertexwahn/appleseed,gospodnetic/appleseed,pjessesco/appleseed,pjessesco/appleseed,Vertexwahn/appleseed,Aakash1312/appleseed,dictoon/appleseed,appleseedhq/appleseed,Aakash1312/appleseed,Biart95/appleseed,docwhite/appleseed