Implement "auto-block-height" method, which temporary set the height of the block to "auto".
Implement auto-block-height if the image position changes.
Implement auto-block-height if the block size changes.
Implement auto-block-height if the image size changes.
Add checkbox to control (enable/disable) the auto-block-height feature.
Merge pull request #25 from 4teamwork/mle-block-height

Automatically set block height