Use EColumnChart to display the progress difference.

- set the column height of the tableviewcell dynamically
- issue: The column can't display a negative value.
Use the TWRChart to display the controlled corporation data.

- only display one chart in the first page, it needs to add another lineChart below it.
Two line charts display in the first scene, the controlled corporation scene.

- issue: Two line charts can't display in the first time, only one appears. The another one will appear in the subsequent times.
Add the line chart title and the line chart legend to the controlled corporation scene.
Add the login scene. Model segue is used from the login scene to the tab segue.

- Since the power plant scene is managed with the subclass of TableViewController, the navigation bar can't added to this scene. This kind of Controller may be substitute in the next version to settle this issue.
Test the network in github.
Hide the status bar in the top of the scenes(the main three scene).
Add four png images to show the status of power units.
Use the static tableView display the unit status.

- The unit status scene will use dynamic cell and data from remote station in next step.
The progress bar couldn't work properly in other style except 'flat' style when tested in the iPhone5s.

- All the progress bar are settled to 'flat' style.
The third scene, 'Power unit status', is realized with ViewController but not TableViewController.

- Navigation bar, table view and tool bar can display correctly. The navigation bar no longer disappear when the table is pulled up.

- The table view can be placed in the ViewController, as long as the ViewController obeys the UITableViewDatasource and UITableViewDelegate protocol.
The second scene, 'Power unit status', is realized with ViewController but not TableViewController.

- Navigation bar, table view and tool bar can display correctly. The navigation bar no longer disappear when the table is pulled up.

- The table view can be placed in the ViewController, as long as the ViewController obeys the UITableViewDatasource and UITableViewDelegate protocol.
Insert  a label to display the value of the difference between the time and the progress.

- Through this way the column chart can display negative values. Next version this way may be replaced.
something unimportant
something unimportant
Merge the master and the modifyNavigationBar brunches.