Reduce the number of reflows on board updates
Set the board quality to low on origin move
Prevent helper JXG.Coords from emitting events
little modification for being able to catch a BOARD_ZOOM in the GUI
Merge branch 'master' into ticklabels
Set boar mode ZOOM only of we are currently in mode NONE
Fixed label problem in "tape measure"
worked on integrating the hand writtig recognizer
Hide the right angle dot if the angle is hidden
Implement new attributes for grid (#41)

The new grid attributes bottomRight and topLeft are given as arrays and restrict the area the grid is drawn in:

    board.create(grid, [], {bottomRight: [5, -5], topLeft: [-5, 5]});

This grid will only be displayed in the square defined by the two points. The coordinates will be interpreted as user coordinates, to use screen coordinates two other attributes are added: tlType and brType. Setting those to JXG.COORDS_BY_SCREEN will tell the grid to interpret the coordinates given in bottomRight and topLeft as screen coordinates.
Code formatting
Update changelog
Improve epub3/jc handling (#40)
Activate zoom in example/vector.html
bug fix integral: this.label had no visProp.
New option for integral: axis: 'x' or 'y' ('x' is default value);
integral option axis: 'x' is the fallback option.
Improvements for integrals on y-axis to handle non-monotone functions.
Merge branch 'ticklabels'

This introduces some speed improvements to the master branch. These improvements
are achieved by reducing the number of reflows done by the browser by removing
the JSXGraph from the board, then updating the board and then hanging the board div
back into the DOM.

Please note that during some event handlers (e.g. update) the DOM elements that
belong to the board that is updated CAN NOT BE FOUND by document.getElementById().
References to these elements need to be stored before the event handler is called.
replaced caretChar with variable containing a colored ¦ as character
implemented non-blinking caret in textbox
caret position can be set with click / touch