fixed Travis build errors.
fixed Travis build errors.

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