Fixed bug with cell sometimes disappearing on drop

Fixed bug with certain elements not rendering.

Updated podspec.

Updated README.

Ask if cell should move for gesture location #13.

Refactored code.

Updated code documentation.

Ensured keyboard is dismissed before dragging.

Fixed issue #8.

Fixed bug with dragged cell hidden after drop.

Fixed bug with glitchy scrolling to top.

Refactored code.

Converted project indentation from tabs to spaces.

Fixed code styling.

Merge pull request #26 from SuperGeroy/patch-1