Added CSS classes for better styling control
Changin ' to "
On document ready, update function is called only when event contains "scroll"
Content of if statement wrapped with { }
Whitespace.
Improve wording on demo page.
Images visible on viewport are not loaded on window resize, if custom event has been used.
Added option for backward compatibility. If custom_event_immediate_load is set to true, then even if custom event was specified, images on viewport will load.
Use .md instead of .markdown
Remove part about tests from README
Merge branch 'feature/css-classes'
Merge branch 'fix/custom-event'