Merge branch 'PolyLineEdgeColors' into 'master'

assign edge colors to the correct provoking vertex

Store edge colors in the second vertex instead of the first one of each line segment. fix issue #25 

See merge request !48
8 jobs for master
Status Job ID Name Coverage
  Test
passed #1666
Linux
clang-c++11-Qt4

00:31:19

passed #1670
Linux
clang-c++11-Qt5

00:47:58

passed #1668
Linux
clang-c++98-Qt4

00:30:35

passed #1672
Linux
clang-c++98-Qt5

00:37:31

passed #1665
Linux
gcc-c++11-Qt4

00:03:32

passed #1669
Linux
gcc-c++11-Qt5

00:03:54

passed #1667
Linux
gcc-c++98-Qt4

00:02:46

passed #1671
Linux
gcc-c++98-Qt5

00:03:04