Fixes #97 - Corrected CueSettingAlign.UppercaseKeyword assertions

- Replaced 3 ASSERT_EQs with assertEquals

- replaced error code with WEBVTT_INVALID_CUESETTING

- replaced error column with 25

- wrapped coomment to 80 columns
Merge pull request #97 from caitp/issue-97

CueSettingAlign.UppercaseKeyword assertions incorrect