Merge pull request #120 from liafailboy/working

renamaed the files
Merge pull request #121 from liafailboy/working

debugged and made the code compile
Merge pull request #122 from liafailboy/working

made new controller class to manipulate category on the screen
Merge pull request #123 from liafailboy/working

deleted two files that we dont use anymore
Reverted from ObservableList to List
Working on buttonDone in taskDetailLayout
Merging step one
Merge pull request #124 from andhieka/working

Reverted from ObservableList to List
Merging step two
Merging step three
Merge pull request #125 from mikelimantara/master

Working on buttonDone in taskDetailLayout
Fix bug in categoryList in TaskManager
Merge pull request #126 from mikelimantara/master

Fix bug in categoryList in TaskManager
minor change
added Categories
added new command and made the Categories appeared