remove files used to to test knockout JS lib
overload Validate.isBetween method to make it possible to specify own error message
add BO code to check Exam and UserExam based on answered questions
mass refactoring to modular tree: student, teacher, admin
question/caegory -> admin/categoryOfQuestion
question/closedQuestion -> teacher/closedQuestion
user -> admin/user
user/group -> admin/userGroup
testTemplate -> teacher/testTemplate
UserLoginController -> LoginController moved to the top controller package
user/settings removed completely

admin and teacher menu adjusted
sitemesh decorator config adjusted