add begin / end iterators for Vector11T component access

6 jobs for cpp11
Status Job ID Name Coverage
  Test
passed #234
Linux
clang-c++11

00:10:09

passed #236
Linux
clang-c++98

00:09:20

passed #233
Linux
gcc-c++11

00:18:13

passed #235
Linux
gcc-c++98

00:13:30

passed #237
Apple
macos-c++11

00:05:47

passed #238
Apple
macos-c++98

00:05:04