Same as CLUBUML116, resolved conflicts.

Updated ProjectDAO to support multiple projects -- Added methods:
getProject(String projectName), 
addProject(Project project),
updateProject(Project project),
disableProject(String projectName),
enableProject(String projectName)
isExisted(String projectName)
getAllProjects()
getDiagramContexts(String Project) //(To be implemented)
getUsers(int projectId)
Merge pull request #34 from ahajirnis/DAO_CLUBUML116_SolveConflict

Same as CLUBUML116, resolved conflicts.