Use 'webvtt_parse_cuesetting' for 'position' cuesettings
Removed trailing whitespace (csposition_unittest.cpp:158)
Remove trailing whitespace (csposition_unittest.cpp:157)
Merge pull request #325 from caitp/position-setting

Use 'webvtt_parse_cuesetting' for 'position' cuesettings
Use 'EXPECT_' rather than 'ASSERT_' in unit-tests, where possible.
Merge pull request #326 from caitp/expect-not-assert

Use 'EXPECT_' rather than 'ASSERT_' in unit-tests, where possible.
Use 'webvtt_parse_cuesetting' for 'size' cuesettings