Made changes to quiz UI
Merge branch 'master' of https://github.com/thans/LaosTrainingApp
Made CSV parser more robust, and modified quiz questions to take a single hint, instead of multiple incorrect-answer explanations.
Cleaned up, removed old quiz activity launcher
Merge branch 'master' of https://github.com/thans/LaosTrainingApp

Conflicts:
	src/com/uwcse/morepractice/MainActivity.java
Implemented a two-attempt quiz system with scoring.
Merge branch 'master' of https://github.com/thans/LaosTrainingApp
Modified CsvParser and QuizQuestion to read image file names from the Excel quiz file. Implemented the new two-attempt quiz system with quiz scoring.
Merge branch 'master' of https://github.com/thans/LaosTrainingApp