Add more git ignore options.

Add support for IB.

Fix frame issue when creating instance with nib.
Remove initWithCoder

As the nib loader does invoke initWithFrame,
it is no longer necessary to keep an initWithCoder method.
Support auto resizing methods

Add intrinsicContentSize and fittingSize, to support auto resizing.
Merge pull request #1 from slavikshen/master

Add support for IB