Add toolVersion block in to Gradle code sample to prevent errors.

Change file mode on `gradle` to be executable (#9)

Gradle defaults to an empty stdin which results in runtime exceptions
when attempting to read from `System.in`. Let's add some sensible
defaults for students who may still need to work with the standard
input stream.

Add configuration for console applications

…to implement A-MoreOOP

…mentation(s) of execute() from previous version. currently unable to run: encountered "could not find or load main class Duke" error :(

…t Level-9 (find), fix String comparison bug

…his.tasks" with "tasks" in TaskList.java

…ddToList method and replace with calls to newTask() and add()

…Gson, remove redundant saveToDisk() and readFromFile() methods from TaskList class

…showError instead of System.out.println

…eTask() for each task type, move TaskType enum to Task class, use createTask() in execute(), remove now-unused newTask() method

… types of exceptions and their error messages, change ui.showError() to use exceptions

…hing after

…oCommand, AddEventCommand and AddDeadlineCommand to AddTaskCommand class

Branch level 8

…to store ui messages, correct Parser to use fullCommand for events and deadlines

…adle, remove unused attributes in Ui class, add some Javadoc

…t getDescription() method in Task class, add taskList param to getId() method, change deleteTask() method to use taskId as param

…ze, Tag and Delete commands. implement C-Tagging

…nd EventTask to better reflect inheritance

…eTask and EventTask to use String as param and parse date within constructor

…tion icon

…ttempt to do the same for Duke

…efault invocation of Duke from CLI to use CliDuke and GUI to use GuiDuke

…e care of customisable colour schemes. configure getUserDialog and getDukeDialog to use background and text colour

…d size. add DropShadow to MessageBox.

… manage to get partially working GUI (yay!)

…ge.save() when ExitCommand() is issued

…geBox to represent different types of message boxes. change Gui class to use these subclasses.

Branch-Level-10

…-Level-10

…GuiDuke, build Jar file

Branch level 10

* 'master' of https://github.com/nattanyz/duke: (22 commits)
  remove redundant print statements in Task class, change filePath for GuiDuke, build Jar file
  remove System.out.println statements. add SaveCommand
  add showUserInput() method to Gui class
  add DukeMessageBox, ExceptionMessageBox, TaskMessageBox and UserMessageBox to represent different types of message boxes. change Gui class to use these subclasses.
  add Storage param back to execute() method in all Commands, add storage.save() when ExitCommand() is issued
  use ui.showMessage() in Storage class, add try/catch blocks to debug, manage to get partially working GUI (yay!)
  partially implement GUI using messageBoxQueue. changed font family and size. add DropShadow to MessageBox.
  complete refactoring from previous commit, add GREY colour scheme
  fix VBox width issue, complete refactoring of dialogBox to messageBox
  refactor: rename DialogBox to MessageBox.add ColourScheme enum to take care of customisable colour schemes. configure getUserDialog and getDukeDialog to use background and text colour
  create CliDuke and GuiDuke classes to implement Duke interface, set default invocation of Duke from CLI to use CliDuke and GUI to use GuiDuke
  continue refactoring in earlier commit
  replace Ui class with Ui interface and Cli and Gui implementations, attempt to do the same for Duke
  refactor: organise methods in Duke class
  fix scrolling and resizing behaviour of MainWindow, add some JavaDoc
  refactor: move GUI-related classes to duke.gui, add title and application icon
  rectify MainWindow fit
  wrap TextField and Button in HBox
  change images to png (but still cannot get them to appear)
  manage to compile and run, opens GUI window
  ...

…adme

Branch tests and assertions

…-Tests-and-Assertions

* 'master' of https://github.com/nattanyz/duke:
  Set theme jekyll-theme-cayman