Merge pull request #219 from ceolter/toolPanel

docs/angular-grid-cell-rendering/index.php

docs/example.html

docs/example.js

src/js/columnController.js

src/js/grid.html

src/js/grid.js

src/js/gridOptionsWrapper.js

src/js/headerRenderer.js

src/js/rowRenderer.js

src/js/toolPanel/columnSelectionPanel.js

src/js/toolPanel/toolPanel.js

src/js/utils.js

src/js/widgets/checkboxSelection.html

src/js/widgets/checkboxSelection.js

src/styles/angular-grid.styl

src/styles/theme-fresh.styl