1.0.3: Make collapse delegate and datasource optional

This change was required due to reported amount of crashes causing by force unwrapped delegate

Increase version number

Update podspec file

Fix bugs Add code improvements

Bug #1: Section arrow image had the wrong direction when opening from code.

Bug #2: Section headers were reusing in the wrong way. This caused the wrong direction of the arrow for open/close sections.

1.0.1

Add demo project

1.0.0

Update folders