self.applyZoom fix - #29

[KarlDoyle]

@bcabanes

#29

Applied fix suggested by bigfree in the issue above.

previous

this.elements.controls.zoomIn.addEventListener('click', function() {
    self.applyZoom(self.zoomInFactor);
});
this.elements.controls.zoomOut.addEventListener('click', function() {
    self.applyZoom(self.zoomOutFactor);
});

changed to

this.elements.controls.zoomIn.addEventListener('click', function() {
    self.applyZoomIn(self.zoomInFactor);
});
this.elements.controls.zoomOut.addEventListener('click', function( {
    self.applyZoomOut(self.zoomOutFactor);
});

[codecov-io]

Current coverage is 78.63%

Merging #31 into master will not affect coverage as of ac8ad62

@@            master     #31   diff @@
======================================
  Files            7       7       
  Stmts          454     454       
  Branches         0       0       
  Methods          0       0       
======================================
  Hit            357     357       
  Partial          0       0       
  Missed          97      97       

Review entire Coverage Diff as of ac8ad62

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