add new entities for UserExams functionality
- Exam
- UserExam
- UserExamClosedQuestion
- UserExamClosedAnswer
add new button title for login functionality
move application name and version from top menu to footer
remove CSS file colors and its usages replacing them with Bootstrap classes: text-danger, text-info, text-success, text-warning, text-primary
allign footer text to left side
small imrpovements of useg glyphicons