Add variant for CP

Adds a commonly used variant to draw polarized caps.
add 3d model for Potentiometer_Trimmer-Suntan-TSR-3386P
add symbol of DS1307+ to special.lib
add symbol of DS1307+ to special.lib
Merge pull request #23 from nwin/patch-1

Add variant for CP
Merge pull request #22 from crackerizer/master

Added 3D models provided by Phinitnan Chanasabaeng.
Revert unwanted deletions
change pin length and text size of DS1307+ and DS1302
change pin length and text size of DS1307+ and DS1302
Merge pull request #24 from andres53016/master

Add 3d model for Potentiometer_Trimmer-Suntan-TSR-3386P
Add symbol of DS1307+ to special.lib
Removed duplicated SOD-106 (DO214) 3d model.
Merge branch 'master' of https://github.com/KiCad/kicad-library